Skip to content
Fencer Vulns
high 7.5

CVE-2026-34087 json

Users API leaks whether privileged users have their user groups disabled for lack of 2FA

published 2026-05-11 5 mo ago modified 2026-10-26 13 d ago also EUVD-2026-29059

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation OATHAuth.

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

Patch / fix

  • Wikimedia Foundation OATHAuth 1.43.7, 1.44.4, 1.45.2
  • mediawiki Debian 12 1:1.39.17-1+deb12u2
  • mediawiki Debian 13 1:1.43.8+dfsg-1~deb13u1
  • mediawiki Debian 14 1:1.43.8+dfsg-1

debian advisories DEBIAN-CVE-2026-34087

  • mediawiki Ubuntu 26.10, Ubuntu 26.04 LTS 1:1.43.8+dfsg-2
  • mediawiki Ubuntu Pro 22.04 LTS 1:1.35.6-1ubuntu0.1~esm1
  • mediawiki Ubuntu Pro 24.04 LTS 1:1.39.7-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2026-34087

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 5.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/S:N/AU:Y/R:A/RE:M
CNA 4.0 5.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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:N/AU:Y/R:A/V:X/RE:M/U:X
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

  • Wikimedia Foundation OATHAuth

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

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.