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Fencer Vulns
high 8.8

CVE-2021-41801 json

The ReplaceText extension through 1.41 for MediaWiki has Incorrect Access Control.

published 2021-10-11 5 y ago modified 2026-06-17 4 mo ago also BIT-mediawiki-2021-41801 , EUVD-2021-28808

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

The ReplaceText extension through 1.41 for MediaWiki has Incorrect Access Control. When a user is blocked after submitting a replace job, the job is still run, even if it may be run at a later time (due to the job queue backlog)

Patch / fix

  • bitnami mediawiki 1.31.16, 1.35.4, 1.36.2
  • mediawiki mediawiki 1.31.16, 1.35.4, 1.36.2
  • mediawiki Debian 14, Debian 13, Debian 12 1:1.35.4-1

debian advisories DEBIAN-CVE-2021-41801

  • mediawiki Arch Linux 1.36.2-1

arch linux advisories AVG-2434

Exploit prediction

1.16% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P
OSV 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
bitnami mediawiki
<1.31.16
>=1.35.0, <1.35.4
>=1.36.0, <1.36.2
1.31.16
1.35.4
1.36.2

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.