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CVE-2021-41801

The ReplaceText extension through 1.41 for MediaWiki has Incorrect Access Control. When a user is...

8.8 HighFix available

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)

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

1.16%Up 0.5 points since Oct 11, 2021
90%50%10%1%

What each source reports

NVD Score used 8.8

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)

Record
CVE-2021-41801
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
6.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
Updated
2026-11-02
CVE List No score

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)

Record
CVE-2021-41801
Updated
2026-11-02
EUVDEUVD-2021-28808 No score

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)

Record
EUVD-2021-28808
Updated
2026-11-03
GitHub AdvisoriesGHSA-rggw-5h76-8v9h 8.8

The ReplaceText extension through 1.41 for MediaWiki has Incorrect Access Control. When a user is...

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)

Record
GHSA-rggw-5h76-8v9h
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-863
Updated
2026-11-02
OSV 8.8

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)

Record
CVE-2021-41801
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-41801 8.8

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)

Record
DEBIAN-CVE-2021-41801
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-41801 8.8

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)

Record
UBUNTU-CVE-2021-41801
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVBIT-mediawiki-2021-41801 No score

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)

Record
BIT-mediawiki-2021-41801
Updated
2026-11-02
OSVMGASA-2021-0477 No score

Updated mediawiki packages fix security vulnerability

XSS vulnerability in Special:Search. (CVE-2021-41798) ApiQueryBacklinks can cause a full table scan. (CVE-2021-41799) Fix PoolCounter protection of Special:Contributions. (CVE-2021-41800) ReplaceText continues performing actions if the user no longer has the correct permission (such as by being blocked). (CVE-2021-41801)

Record
MGASA-2021-0477
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mediawiki
Bitnami
 before 1.31.16, 1.35.0 up to 1.35.4, 1.36.0 up to 1.36.2
1.31.161.35.41.36.2
mediawiki
Debian:12
 before 1:1.35.4-1
1:1.35.4-1
mediawiki
Debian:13
 before 1:1.35.4-1
1:1.35.4-1
mediawiki
Debian:14
 before 1:1.35.4-1
1:1.35.4-1
mediawiki
Debian:10
From an advisory covering 5 CVEs
 before 1:1.31.16-1~deb10u1, plus listed versions
1:1.31.10-1~deb10u11:1.31.12-1~deb10u11:1.31.14-1~deb10u11:1.31.2-11:1.31.4-1
Show 9 moreShow less
1:1.31.4-1~deb10u11:1.31.5-11:1.31.5-21:1.31.5-31:1.31.6-11:1.31.6-1~deb10u11:1.31.7-11:1.31.7-1~deb10u11:1.31.8-1
1:1.31.16-1~deb10u1
mediawiki
Debian:11
From an advisory covering 5 CVEs
 before 1:1.35.4-1~deb11u1, plus listed versions
1:1.35.2-11:1.35.3-1
1:1.35.4-1~deb11u1
mediawiki
Mageia:8
From an advisory covering 4 CVEs
 before 1.35.4-1.mga8
1.35.4-1.mga8
mediawiki
Ubuntu:18.04:LTS
 All versions, plus listed versions
1:1.27.3-11:1.27.4-11:1.27.4-21:1.27.4-3
 None known
mediawiki
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
1:1.31.2-1ubuntu11:1.31.5-11:1.31.5-1ubuntu11:1.31.5-21:1.31.5-3
Show 4 moreShow less
1:1.31.5-3ubuntu11:1.31.6-11:1.31.7-11:1.31.7-1ubuntu0.1~esm1
 None known
mediawiki
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
1:1.35.3-11:1.35.4-11:1.35.5-11:1.35.5-1ubuntu11:1.35.5-1ubuntu21:1.35.5-1ubuntu31:1.35.6-11:1.35.6-1ubuntu0.1~esm1
 None known
Show 4 moreShow less
Affected packages
PackageAffectedFixed
mediawiki
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
1:1.39.4-21:1.39.5-11:1.39.6-11:1.39.7-11:1.39.7-1ubuntu0.1~esm1
 None known
mediawiki
Ubuntu:25.10
 All versions, plus listed versions
1:1.43.1+dfsg-11:1.43.1+dfsg-21:1.43.3+dfsg-1
 None known
mediawiki
Ubuntu:26.10
 All versions, plus listed versions
1:1.43.8+dfsg-21:1.43.9+dfsg-11:1.43.9+dfsg-1ubuntu1
 None known
mediawiki
Ubuntu:26.04:LTS
 All versions, plus listed versions
1:1.43.3+dfsg-11:1.43.5+dfsg-11:1.43.6+dfsg-21:1.43.8+dfsg-11:1.43.8+dfsg-2
 None known

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-41801 is a high vulnerability (CVSS 8.8) in Mediawiki, published October 1, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.16%, the 67th percentile. Fixed in mediawiki 1.31.16.

References

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