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Fencer Vulns
high 7.5

CVE-2026-34088 json

RecentChanges entries expose suppressed content via generated log page html

published 2026-05-11 5 mo ago modified 2026-10-26 13 d ago also EUVD-2026-29060

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 21%
public exploits
0
none known

Summary

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

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

Patch / fix

  • Wikimedia Foundation MediaWiki 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-2026-34088

  • mediawiki Ubuntu 26.10, Ubuntu 26.04 LTS 1:1.43.8+dfsg-2
  • mediawiki Ubuntu Pro 20.04 LTS 1:1.31.7-1ubuntu0.1~esm1
  • 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-2026-34088

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

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-34088 updated cvss 7.5

mediawiki: RecentChanges entries expose suppressed content via generated log page html

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 1.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/R:U/RE:M
CNA 4.0 1.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/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:X/AU:X/R:U/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 MediaWiki

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.