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Fencer Intel
medium 5.3

CVE-2020-35477 json

MediaWiki before 1.35.1 blocks legitimate attempts to hide log entries in some situations.

published 5y ago modified 4mo ago also BIT-mediawiki-2020-35477 , EUVD-2020-23148

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

MediaWiki before 1.35.1 blocks legitimate attempts to hide log entries in some situations. If one sets MediaWiki:Mainpage to Special:MyLanguage/Main Page, visits a log entry on Special:Log, and toggles the "Change visibility of selected log entries" checkbox (or a tags checkbox) next to it, there is a redirection to the main page's action=historysubmit (instead of the desired behavior in which a revision-deletion form appears).

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-2020-35477

  • mediawiki Arch Linux 1.35.1-1

arch linux advisories AVG-1371

Is CVE-2020-35477 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2020-35477 updated cvss 5.3

mediawiki: unable to change visibility of log entries when MediaWiki:Mainpage uses Special:MyLanguage

  • 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

1.72% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

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

Affected packages

ecosystem package affected fixed in
bitnami mediawiki
<1.35.1
1.35.1

Classification

Weakness
  • CWE-670 Always-Incorrect Control Flow Implementation

References

Sources

Fencer Intel 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.