CVE-2026-34086 json
AbuseFilter misuses ::userCanBitfield, exposing access-controlled information
published 2026-05-11 5 mo ago modified 2026-10-26 13 d 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
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).
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 Vulns 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.