CVE-2026-34086 json
AbuseFilter misuses ::userCanBitfield, exposing access-controlled information
published 5mo ago modified 14d ago also EUVD-2026-29058
- cvss
- 2.1
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 15%
- public exploits
- 0
- none known
Summary
Vulnerability in Wikimedia Foundation AbuseFilter.
This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.
Patch / fix
- Wikimedia Foundation AbuseFilter 1.43.7, 1.44.4, 1.45.2
- mediawiki Debian 13 1:1.43.8+dfsg-1~deb13u1
- mediawiki Debian 14 1:1.43.8+dfsg-1
debian advisories DEBIAN-CVE-2026-34086
Is CVE-2026-34086 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 2.1 | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/S:N/AU:Y |
| CNA | 4.0 | 2.1 | CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/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:N/AU:Y/R:X/V:X/RE:X/U:X |
Affected products
- Wikimedia Foundation AbuseFilter
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
Sources
- CVE List CVE-2026-34086
- NVD CVE-2026-34086
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.