CVE catalog

CVE-2026-74998

In Roundcube Webmail before 1.6.18 and 1.7.x before…

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scripting) via MIME sniffing.

Severity: High · CVSS 7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Published: Aug 17, 2026, 12:40:29 PM UTC
Updated: Aug 17, 2026, 1:16:54 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.44% · Oct 27, 2026

Projects and upstream resources

[roundcube][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiantrixie-security	roundcube	`1.6.20+dfsg-0+deb13u1`	Fixed	[CVE-2026-74998]
Debiantrixie	roundcube	`1.6.18+dfsg-0+deb13u1`	FixedDistribution-reported fixed boundary	[CVE-2026-74998]
Debiansid	roundcube	`1.6.18+dfsg-1`	FixedDistribution-reported fixed boundary	[CVE-2026-74998]
Debiansid	roundcube	`1.6.20+dfsg-1`	Fixed	[CVE-2026-74998]
Debianforky	roundcube	`1.6.18+dfsg-1`	FixedDistribution-reported fixed boundary	[CVE-2026-74998]
Debianforky	roundcube	`1.6.20+dfsg-1`	Fixed	[CVE-2026-74998]
Debianbookworm-security	roundcube	`1.6.5+dfsg-1+deb12u12`	Fixed	[CVE-2026-74998]
Debianbookworm	roundcube	`1.6.5+dfsg-1+deb12u11`	FixedDistribution-reported fixed boundary	[CVE-2026-74998]

Showing 8 fix observations. All 9 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
Debianbookworm	roundcube	`1.6.5+dfsg-1+deb12u11`	FixedDistribution-reported fixed boundary	[CVE-2026-74998]
Debianbookworm	roundcube	`1.6.5+dfsg-1+deb12u9`	Affected	[CVE-2026-74998]
Debianbookworm-security	roundcube	`1.6.5+dfsg-1+deb12u12`	Fixed	[CVE-2026-74998]
Debianforky	roundcube	`1.6.18+dfsg-1`	FixedDistribution-reported fixed boundary	[CVE-2026-74998]
Debianforky	roundcube	`1.6.20+dfsg-1`	Fixed	[CVE-2026-74998]
Debiansid	roundcube	`1.6.18+dfsg-1`	FixedDistribution-reported fixed boundary	[CVE-2026-74998]
Debiansid	roundcube	`1.6.20+dfsg-1`	Fixed	[CVE-2026-74998]
Debiantrixie	roundcube	`1.6.18+dfsg-0+deb13u1`	FixedDistribution-reported fixed boundary	[CVE-2026-74998]
Debiantrixie-security	roundcube	`1.6.20+dfsg-0+deb13u1`	Fixed	[CVE-2026-74998]

Original provider fields

{
  "package_releases": [
    {
      "name": "roundcube",
      "status": "fixed",
      "release": "sid",
      "version": "1.6.20+dfsg-1"
    },
    {
      "name": "roundcube",
      "status": "fixed",
      "release": "forky",
      "version": "1.6.20+dfsg-1"
    },
    {
      "name": "roundcube",
      "status": "fixed",
      "release": "trixie",
      "version": "1.6.18+dfsg-0+deb13u1"
    },
    {
      "name": "roundcube",
      "status": "fixed",
      "release": "trixie-security",
      "version": "1.6.20+dfsg-0+deb13u1"
    },
    {
      "name": "roundcube",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "1.6.5+dfsg-1+deb12u9"
    },
    {
      "name": "roundcube",
      "status": "fixed",
      "release": "bookworm-security",
      "version": "1.6.5+dfsg-1+deb12u12"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1144059,
      "name": "roundcube",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "1.6.18+dfsg-1"
    },
    {
      "bug": 1144059,
      "name": "roundcube",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "1.6.18+dfsg-1"
    },
    {
      "bug": 1144059,
      "name": "roundcube",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "1.6.18+dfsg-0+deb13u1"
    },
    {
      "bug": 1144059,
      "name": "roundcube",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "1.6.5+dfsg-1+deb12u11"
    }
  ],
  "distribution_packages": [
    {
      "name": "webmail",
      "ranges": [
        {
          "fixed": "1.7.3",
          "introduced": "1.7.0",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "provider_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74998",
      "fixed_version": "1.7.3",
      "provider_source": "nvd",
      "provider_record_id": "NVD-CVE-2026-74998",
      "provider_updated_at": "2026-09-08T19:10:00.133"
    }
  ]
}

[Debian bug #1144059]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[roundcube]Unknown
Details (4)
- 1.6.5+dfsg-1+deb12u9 · all · bookworm
  Affected · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u9 · all · bookworm
  Affected · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u11 · all · bookworm-security
  Fixed · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u11 · all · bookworm-security
  Fixed · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
[roundcube-core]Unknown
Source package: [roundcube]
Details (4)
- 1.6.5+dfsg-1+deb12u9 · all · bookworm
  Affected · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u9 · all · bookworm
  Affected · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u11 · all · bookworm-security
  Fixed · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u11 · all · bookworm-security
  Fixed · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
[roundcube-mysql]Unknown
Source package: [roundcube]
Details (4)
- 1.6.5+dfsg-1+deb12u9 · all · bookworm
  Affected · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u9 · all · bookworm
  Affected · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u11 · all · bookworm-security
  Fixed · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u11 · all · bookworm-security
  Fixed · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
[roundcube-pgsql]Unknown
Source package: [roundcube]
Details (4)
- 1.6.5+dfsg-1+deb12u9 · all · bookworm
  Affected · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u9 · all · bookworm
  Affected · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u11 · all · bookworm-security
  Fixed · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u11 · all · bookworm-security
  Fixed · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
[roundcube-plugins]Unknown
Source package: [roundcube]
Details (4)
- 1.6.5+dfsg-1+deb12u9 · all · bookworm
  Affected · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u9 · all · bookworm
  Affected · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u11 · all · bookworm-security
  Fixed · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u11 · all · bookworm-security
  Fixed · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
[roundcube-sqlite3]Unknown
Source package: [roundcube]
Details (4)
- 1.6.5+dfsg-1+deb12u9 · all · bookworm
  Affected · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u9 · all · bookworm
  Affected · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u11 · all · bookworm-security
  Fixed · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12
- 1.6.5+dfsg-1+deb12u11 · all · bookworm-security
  Fixed · Fixed: 1.6.5+dfsg-1+deb12u11
  nvd · roundcube · debian · bookworm; nvd · roundcube · debian · 12

[Debian 13 (Trixie)]

[roundcube]Unknown
Details (7)
- 1.6.16+dfsg-0+deb13u1 · all · trixie
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.16+dfsg-0+deb13u1 · all · trixie
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.17+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.18+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.18+dfsg-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.19+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.20+dfsg-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
[roundcube-core]Unknown
Source package: [roundcube]
Details (7)
- 1.6.16+dfsg-0+deb13u1 · all · trixie
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.16+dfsg-0+deb13u1 · all · trixie
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.17+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.18+dfsg-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.18+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.19+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.20+dfsg-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
[roundcube-mysql]Unknown
Source package: [roundcube]
Details (7)
- 1.6.16+dfsg-0+deb13u1 · all · trixie
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.16+dfsg-0+deb13u1 · all · trixie
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.17+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.18+dfsg-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.18+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.19+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.20+dfsg-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
[roundcube-pgsql]Unknown
Source package: [roundcube]
Details (7)
- 1.6.16+dfsg-0+deb13u1 · all · trixie
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.16+dfsg-0+deb13u1 · all · trixie
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.17+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.18+dfsg-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.18+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.19+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.20+dfsg-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
[roundcube-plugins]Unknown
Source package: [roundcube]
Details (7)
- 1.6.16+dfsg-0+deb13u1 · all · trixie
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.16+dfsg-0+deb13u1 · all · trixie
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.17+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.18+dfsg-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.18+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.19+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.20+dfsg-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
[roundcube-sqlite3]Unknown
Source package: [roundcube]
Details (7)
- 1.6.16+dfsg-0+deb13u1 · all · trixie
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.16+dfsg-0+deb13u1 · all · trixie
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.17+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Affected · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.18+dfsg-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.18+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.19+dfsg-0+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13
- 1.6.20+dfsg-0+deb13u1 · all · trixie-security
  Fixed · Fixed: 1.6.18+dfsg-0+deb13u1
  nvd · roundcube · debian · 13

Observed: Oct 27, 2026, 7:05:03 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]