CVE catalog
CVE-2026-34090
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser. This issue affects CheckUser: from 1.45.0 before 1.45.2.
- Severity
- Medium · CVSS 4.8
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.28% · Oct 25, 2026
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation CheckUser. This issue affects CheckUser: from 1.45.0 before 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 | not affected |
| Debian | mediawiki | forky | 1:1.43.11+dfsg-1 | not affected |
| Debian | mediawiki | trixie | 1:1.43.9+dfsg-1~deb13u1 | not affected |
| Debian | mediawiki | trixie-security | 1:1.43.9+dfsg-1~deb13u1 | not affected |
| Debian | mediawiki | bookworm | 1:1.39.17-1+deb12u2 | not affected |
| Debian | mediawiki | bookworm-security | 1:1.39.17-1+deb12u2 | not affected |
| Cpe | checkuser | Not reported | 1.45.2 | fixed |
| Cpe | checkuser | Not reported | 1.45.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | mediawiki | source | sid | Not affected | unimportant | Not reported | Not reported |
| Debian | mediawiki | source | forky | Not affected | unimportant | Not reported | Not reported |
| Debian | mediawiki | source | trixie | Not affected | unimportant | Not reported | Not reported |
| Debian | mediawiki | source | bookworm | Not affected | unimportant | Not reported | Not reported |
| Cpe | checkuser | cpe | Not reported | 1.45.2 | Not reported | Not reported | Not reported |
| Cpe | checkuser | cpe | Not reported | 1.45.2 | Not reported | NVD-CVE-2026-34090 | 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
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-34090]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-34090]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-34090]
- [https://phabricator.wikimedia.org/T411366]
- [https://security-tracker.debian.org/tracker/CVE-2026-34090]
- [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]