CVE catalog
CVE-2026-34091
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.29% · Oct 25, 2026
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | mediawiki | sid | 1:1.43.11+dfsg-3 | fixed |
| Debian | mediawiki | forky | 1:1.43.11+dfsg-1 | fixed |
| Debian | mediawiki | trixie | 1:1.43.9+dfsg-1~deb13u1 | fixed |
| Debian | mediawiki | trixie-security | 1:1.43.9+dfsg-1~deb13u1 | fixed |
| Debian | mediawiki | bookworm | 1:1.39.17-1+deb12u2 | not affected |
| Debian | mediawiki | bookworm-security | 1:1.39.17-1+deb12u2 | not affected |
| Cpe | mediawiki | Not reported | 1.43.7 | fixed |
| Cpe | mediawiki | Not reported | 1.44.4 | fixed |
| Cpe | mediawiki | Not reported | 1.45.2 | fixed |
| Ubuntu | mediawiki | 25.10 | 1:1.43.1+dfsg-1 | vulnerable |
| Ubuntu | mediawiki | 25.10 | 1:1.43.1+dfsg-2 | vulnerable |
| Ubuntu | mediawiki | 25.10 | 1:1.43.3+dfsg-1 | vulnerable |
| Ubuntu | mediawiki | 26.04 | 1:1.43.3+dfsg-1 | vulnerable |
| Ubuntu | mediawiki | 26.04 | 1:1.43.5+dfsg-1 | vulnerable |
| Ubuntu | mediawiki | 26.04 | 1:1.43.6+dfsg-2 | vulnerable |
| Ubuntu | mediawiki | 26.04 | 1:1.43.8+dfsg-1 | vulnerable |
| Ubuntu | mediawiki | 26.04 | 1:1.43.8+dfsg-2 | fixed |
| Cpe | mediawiki | Not reported | 1.45.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | mediawiki | source | sid | 1:1.43.8+dfsg-1 | not yet assigned | Not reported | Not reported |
| Debian | mediawiki | source | forky | 1:1.43.8+dfsg-1 | not yet assigned | Not reported | Not reported |
| Debian | mediawiki | source | trixie | 1:1.43.8+dfsg-1~deb13u1 | not yet assigned | Not reported | Not reported |
| Debian | mediawiki | source | bookworm | Not affected | unimportant | Not reported | Not reported |
| Cpe | mediawiki | cpe | Not reported | 1.43.7 | Not reported | Not reported | Not reported |
| Cpe | mediawiki | cpe | Not reported | 1.44.4 | Not reported | Not reported | Not reported |
| Cpe | mediawiki | cpe | Not reported | 1.45.2 | Not reported | Not reported | Not reported |
| Ubuntu | mediawiki | deb | 26.04 | 1:1.43.8+dfsg-2 | Not reported | UBUNTU-CVE-2026-34091 | Not reported |
| Cpe | mediawiki | cpe | Not reported | 1.45.2 | Not reported | NVD-CVE-2026-34091 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [mediawiki]Not affected
Details (4)
1:1.39.17-1+deb12u2· all · bookwormNot affected
nvd · mediawiki · debian · bookworm
1:1.39.17-1+deb12u2· all · bookwormNot affected
nvd · mediawiki · debian · bookworm
1:1.39.17-1+deb12u2· all · bookworm-securityNot affected
nvd · mediawiki · debian · bookworm
1:1.39.17-1+deb12u2· all · bookworm-securityNot affected
nvd · mediawiki · debian · bookworm
- [mediawiki-classes]Not affected
Source package: [mediawiki]
Details (4)
1:1.39.17-1+deb12u2· all · bookwormNot affected
nvd · mediawiki · debian · bookworm
1:1.39.17-1+deb12u2· all · bookwormNot affected
nvd · mediawiki · debian · bookworm
1:1.39.17-1+deb12u2· all · bookworm-securityNot affected
nvd · mediawiki · debian · bookworm
1:1.39.17-1+deb12u2· all · bookworm-securityNot affected
nvd · mediawiki · debian · bookworm
[Debian 13 (Trixie)]
- [mediawiki]Fixed
Details (4)
1:1.43.9+dfsg-1~deb13u1· all · trixieFixed · Fixed:
1:1.43.8+dfsg-1~deb13u1nvd · mediawiki · debian · 13
1:1.43.9+dfsg-1~deb13u1· all · trixieFixed · Fixed:
1:1.43.8+dfsg-1~deb13u1nvd · mediawiki · debian · 13
1:1.43.9+dfsg-1~deb13u1· all · trixie-securityFixed · Fixed:
1:1.43.8+dfsg-1~deb13u1nvd · mediawiki · debian · 13
1:1.43.9+dfsg-1~deb13u1· all · trixie-securityFixed · Fixed:
1:1.43.8+dfsg-1~deb13u1nvd · mediawiki · debian · 13
- [mediawiki-classes]Fixed
Source package: [mediawiki]
Details (4)
1:1.43.9+dfsg-1~deb13u1· all · trixieFixed · Fixed:
1:1.43.8+dfsg-1~deb13u1nvd · mediawiki · debian · 13
1:1.43.9+dfsg-1~deb13u1· all · trixieFixed · Fixed:
1:1.43.8+dfsg-1~deb13u1nvd · mediawiki · debian · 13
1:1.43.9+dfsg-1~deb13u1· all · trixie-securityFixed · Fixed:
1:1.43.8+dfsg-1~deb13u1nvd · mediawiki · debian · 13
1:1.43.9+dfsg-1~deb13u1· all · trixie-securityFixed · Fixed:
1:1.43.8+dfsg-1~deb13u1nvd · mediawiki · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-34091]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-34091]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-34091]
- [https://phabricator.wikimedia.org/T411305]
- [https://security-tracker.debian.org/tracker/CVE-2026-34091]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34091.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0946.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]