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Fencer Vulns
medium 5.3

CVE-2020-35480 json

An issue was discovered in MediaWiki before 1.35.1.

published 2020-12-18 5 y ago modified 2026-06-17 4 mo ago also BIT-mediawiki-2020-35480 , EUVD-2020-23151

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

An issue was discovered in MediaWiki before 1.35.1. Missing users (accounts that don't exist) and hidden users (accounts that have been explicitly hidden due to being abusive, or similar) that the viewer cannot see are handled differently, exposing sensitive information about the hidden status to unprivileged viewers. This exists on various code paths.

Patch / fix

  • bitnami mediawiki 1.35.1
  • mediawiki mediawiki 1.35.1
  • mediawiki Debian 14, Debian 13, Debian 12 1:1.35.1-1

debian advisories DEBIAN-CVE-2020-35480

  • mediawiki Arch Linux 1.35.1-1

arch linux advisories AVG-1371

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-2020-35480 updated cvss 5.3

mediawiki: divergent behavior for contributions and user pages of hidden users and missing users

  • Red Hat OpenShift Container Platform 3.11 mediawiki
    affected: no fix available “Fix deferred”
  • Red Hat OpenShift Container Platform 4 mediawiki
    affected: no fix planned “Out of support scope”

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

Exploit prediction

1.49% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
bitnami mediawiki
<1.35.1
1.35.1

Classification

Weakness

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.