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CVE-2026-34086

AbuseFilter misuses ::userCanBitfield, exposing access-controlled information

2.1 LowFix available

Vulnerability in Wikimedia Foundation AbuseFilter.

This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
Low
User interaction
Passive

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.24%Up 0.2 points since May 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 2.1

AbuseFilter misuses ::userCanBitfield, exposing access-controlled information

Vulnerability in Wikimedia Foundation AbuseFilter.

This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.

Record
CVE-2026-34086
CVSS 4.0
2.1 LowCVSS: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
Weakness
CWE-20
Updated
2026-11-02
EUVDEUVD-2026-29058 2.1

Vulnerability in Wikimedia Foundation AbuseFilter.

This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.

Record
EUVD-2026-29058
CVSS 4.0
2.1 LowCVSS: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
Updated
2026-11-02
GitHub AdvisoriesGHSA-5qc5-wp75-wxgx 2.1

Vulnerability in Wikimedia Foundation AbuseFilter. This issue affects AbuseFilter: from * before...

Vulnerability in Wikimedia Foundation AbuseFilter.

This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.

Record
GHSA-5qc5-wp75-wxgx
CVSS 4.0
2.1 LowCVSS: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
Weakness
CWE-20
Updated
2026-11-02
NVD 2.1

Vulnerability in Wikimedia Foundation AbuseFilter.

This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.

Record
CVE-2026-34086
CVSS 4.0
2.1 LowCVSS: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
Weakness
CWE-20
Updated
2026-11-02
OSVDEBIAN-CVE-2026-34086 2.1

Vulnerability in Wikimedia Foundation AbuseFilter. This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.

Record
DEBIAN-CVE-2026-34086
CVSS 4.0
2.1 LowCVSS: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
Updated
2026-11-02
OSVUBUNTU-CVE-2026-34086 2.1

Vulnerability in Wikimedia Foundation AbuseFilter. This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.

Record
UBUNTU-CVE-2026-34086
CVSS 4.0
2.1 LowCVSS: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
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mediawiki
Debian:12
 All versions, plus listed versions
1:1.39.10-11:1.39.10-1~deb12u11:1.39.12-1~deb12u11:1.39.13-1~deb12u11:1.39.17-1+deb12u2
Show 29 moreShow less
1:1.39.17-1~deb12u11:1.39.2-11:1.39.4-11:1.39.4-1~deb12u11:1.39.4-21:1.39.5-11:1.39.5-1~deb12u11:1.39.6-11:1.39.7-11:1.39.7-1~deb12u11:1.39.8-11:1.43.0+dfsg-11:1.43.0+dfsg-21:1.43.1+dfsg-11:1.43.1+dfsg-21:1.43.10+dfsg-11:1.43.11+dfsg-11:1.43.11+dfsg-21:1.43.11+dfsg-31:1.43.3+dfsg-11:1.43.5+dfsg-11:1.43.6+dfsg-11:1.43.6+dfsg-1~deb13u11:1.43.6+dfsg-21:1.43.8+dfsg-11:1.43.8+dfsg-1~deb13u11:1.43.8+dfsg-21:1.43.9+dfsg-11:1.43.9+dfsg-1~deb13u1
 None known
mediawiki
Debian:13
 before 1:1.43.8+dfsg-1~deb13u1, plus listed versions
1:1.43.3+dfsg-11:1.43.5+dfsg-11:1.43.6+dfsg-11:1.43.6+dfsg-1~deb13u11:1.43.6+dfsg-2
1:1.43.8+dfsg-1~deb13u1
mediawiki
Debian:14
 before 1:1.43.8+dfsg-1, plus listed versions
1:1.43.3+dfsg-11:1.43.5+dfsg-11:1.43.6+dfsg-11:1.43.6+dfsg-1~deb13u11:1.43.6+dfsg-21:1.43.8+dfsg-1~deb13u1
1:1.43.8+dfsg-1
mediawiki
Ubuntu:18.04:LTS
 All versions, plus listed versions
1:1.27.3-11:1.27.4-11:1.27.4-21:1.27.4-3
 None known
mediawiki
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
1:1.31.2-1ubuntu11:1.31.5-11:1.31.5-1ubuntu11:1.31.5-21:1.31.5-3
Show 4 moreShow less
1:1.31.5-3ubuntu11:1.31.6-11:1.31.7-11:1.31.7-1ubuntu0.1~esm1
 None known
mediawiki
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
1:1.35.3-11:1.35.4-11:1.35.5-11:1.35.5-1ubuntu11:1.35.5-1ubuntu21:1.35.5-1ubuntu31:1.35.6-11:1.35.6-1ubuntu0.1~esm1
 None known
mediawiki
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
1:1.39.4-21:1.39.5-11:1.39.6-11:1.39.7-11:1.39.7-1ubuntu0.1~esm1
 None known
mediawiki
Ubuntu:25.10
 All versions, plus listed versions
1:1.43.1+dfsg-11:1.43.1+dfsg-21:1.43.3+dfsg-1
 None known
mediawiki
Ubuntu:26.10
 All versions, plus listed versions
1:1.43.8+dfsg-21:1.43.9+dfsg-11:1.43.9+dfsg-1ubuntu1
 None known
mediawiki
Ubuntu:26.04:LTS
 All versions, plus listed versions
1:1.43.3+dfsg-11:1.43.5+dfsg-11:1.43.6+dfsg-21:1.43.8+dfsg-11:1.43.8+dfsg-2
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-34086 is a low vulnerability (CVSS 2.1) in Wikimedia Foundation Abusefilter, published May 11, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 15th percentile. Fixed in mediawiki 1:1.43.8+dfsg-1~deb13u1.

References

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