Vulnerability · Published Jul 1, 2026 · Assigned by wikimedia-foundation
CVE-2026-58027QueryAbuseFilter API can be used to see the hit count of private filters, which is hidden in the UI
Medium 5.3
In plain English
A medium-severity information exposure in AbuseFilter from Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation AbuseFilter. This vulnerability is associated with program files includes/Api/QueryAbuseFilters.Php. This issue affects AbuseFilter: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mediawiki | no fix listed | DEBIAN-CVE-2026-58027 |
| Debian:13 | mediawiki | 1:1.43.9+dfsg-1~deb13u1 | DEBIAN-CVE-2026-58027 |
| Debian:14 | mediawiki | 1:1.43.9+dfsg-1 | DEBIAN-CVE-2026-58027 |
| Ubuntu:25.10 | mediawiki | no fix listed | UBUNTU-CVE-2026-58027 |
| Ubuntu:26.04:LTS | mediawiki | no fix listed | UBUNTU-CVE-2026-58027 |
| Ubuntu:26.10 | mediawiki | no fix listed | UBUNTU-CVE-2026-58027 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Wikimedia Foundation | AbuseFilter | * – before 1.46.0, 1.45.4, 1.44.6, 1.43.9 |
Weakness: CWE-200 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N