CVE catalog

CVE-2021-44857

mediawiki affected and fixed versions

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. It is possible to use action=mcrundo followed by action=mcrrestore to replace the content of any arbitrary page (that the user doesn't have edit rights for). This applies to any public wiki, or a private wiki that has at least one page set in $wgWhitelistRead.

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Published: Dec 15, 2021, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.90% · Oct 27, 2026

Projects and upstream resources

[mediawiki][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	mediawiki	`1:1.43.9+dfsg-1~deb13u1`	Fixed	[CVE-2021-44857]
Debiantrixie	mediawiki	`1:1.35.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-44857]
Debiantrixie	mediawiki	`1:1.43.9+dfsg-1~deb13u1`	Fixed	[CVE-2021-44857]
Debiansid	mediawiki	`1:1.35.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-44857]
Debiansid	mediawiki	`1:1.43.11+dfsg-3`	Fixed	[CVE-2021-44857]
Debianforky	mediawiki	`1:1.35.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-44857]
Debianforky	mediawiki	`1:1.43.11+dfsg-1`	Fixed	[CVE-2021-44857]
Debianbookworm-security	mediawiki	`1:1.39.17-1+deb12u2`	Fixed	[CVE-2021-44857]
Debianbookworm	mediawiki	`1:1.35.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-44857]
Debianbookworm	mediawiki	`1:1.39.17-1+deb12u2`	Fixed	[CVE-2021-44857]

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
Debianbookworm	mediawiki	`1:1.35.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-44857]
Debianbookworm	mediawiki	`1:1.39.17-1+deb12u2`	Fixed	[CVE-2021-44857]
Debianbookworm-security	mediawiki	`1:1.39.17-1+deb12u2`	Fixed	[CVE-2021-44857]
Debianforky	mediawiki	`1:1.35.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-44857]
Debianforky	mediawiki	`1:1.43.11+dfsg-1`	Fixed	[CVE-2021-44857]
Debiansid	mediawiki	`1:1.35.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-44857]
Debiansid	mediawiki	`1:1.43.11+dfsg-3`	Fixed	[CVE-2021-44857]
Debiantrixie	mediawiki	`1:1.35.5-1`	FixedDistribution-reported fixed boundary	[CVE-2021-44857]
Debiantrixie	mediawiki	`1:1.43.9+dfsg-1~deb13u1`	Fixed	[CVE-2021-44857]
Debiantrixie-security	mediawiki	`1:1.43.9+dfsg-1~deb13u1`	Fixed	[CVE-2021-44857]

Original provider fields

{
  "package_releases": [
    {
      "name": "mediawiki",
      "status": "fixed",
      "release": "sid",
      "version": "1:1.43.11+dfsg-3"
    },
    {
      "name": "mediawiki",
      "status": "fixed",
      "release": "forky",
      "version": "1:1.43.11+dfsg-1"
    },
    {
      "name": "mediawiki",
      "status": "fixed",
      "release": "trixie",
      "version": "1:1.43.9+dfsg-1~deb13u1"
    },
    {
      "name": "mediawiki",
      "status": "fixed",
      "release": "trixie-security",
      "version": "1:1.43.9+dfsg-1~deb13u1"
    },
    {
      "name": "mediawiki",
      "status": "fixed",
      "release": "bookworm",
      "version": "1:1.39.17-1+deb12u2"
    },
    {
      "name": "mediawiki",
      "status": "fixed",
      "release": "bookworm-security",
      "version": "1:1.39.17-1+deb12u2"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "mediawiki",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "1:1.35.5-1"
    },
    {
      "bug": null,
      "name": "mediawiki",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "1:1.35.5-1"
    },
    {
      "bug": null,
      "name": "mediawiki",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "1:1.35.5-1"
    },
    {
      "bug": null,
      "name": "mediawiki",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "1:1.35.5-1"
    }
  ],
  "distribution_packages": []
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[mediawiki]Unknown
Details (4)
- 1:1.39.17-1+deb12u2 · all · bookworm
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · bookworm; dsa · mediawiki · debian · 12
- 1:1.39.17-1+deb12u2 · all · bookworm
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · bookworm; dsa · mediawiki · debian · 12
- 1:1.39.17-1+deb12u2 · all · bookworm-security
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · bookworm; dsa · mediawiki · debian · 12
- 1:1.39.17-1+deb12u2 · all · bookworm-security
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · bookworm; dsa · mediawiki · debian · 12
[mediawiki-classes]Unknown
Source package: [mediawiki]
Details (4)
- 1:1.39.17-1+deb12u2 · all · bookworm
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · bookworm; dsa · mediawiki · debian · 12
- 1:1.39.17-1+deb12u2 · all · bookworm
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · bookworm; dsa · mediawiki · debian · 12
- 1:1.39.17-1+deb12u2 · all · bookworm-security
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · bookworm; dsa · mediawiki · debian · 12
- 1:1.39.17-1+deb12u2 · all · bookworm-security
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · bookworm; dsa · mediawiki · debian · 12

[Debian 13 (Trixie)]

[mediawiki]Unknown
Details (4)
- 1:1.43.9+dfsg-1~deb13u1 · all · trixie
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · 13
- 1:1.43.9+dfsg-1~deb13u1 · all · trixie
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · 13
- 1:1.43.9+dfsg-1~deb13u1 · all · trixie-security
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · 13
- 1:1.43.9+dfsg-1~deb13u1 · all · trixie-security
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · 13
[mediawiki-classes]Unknown
Source package: [mediawiki]
Details (4)
- 1:1.43.9+dfsg-1~deb13u1 · all · trixie
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · 13
- 1:1.43.9+dfsg-1~deb13u1 · all · trixie
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · 13
- 1:1.43.9+dfsg-1~deb13u1 · all · trixie-security
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · 13
- 1:1.43.9+dfsg-1~deb13u1 · all · trixie-security
  Fixed · Fixed: 1:1.35.5-1
  dsa · mediawiki · debian · 13

Observed: Oct 23, 2026, 6:03:47 PM UTC

References

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