CVE-2021-41798

MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being...

6.1 MediumFix available

MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: None

Exploit likelihood

1.44%Up 1.0 points since Oct 11, 2021

What each source reports

NVD Score used 6.1

MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.

Record: CVE-2021-41798
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:P/A:N
Weakness: CWE-79
Updated: 2026-11-02

CVE List No score

MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.

Record: CVE-2021-41798
Updated: 2026-11-02

EUVDEUVD-2021-28806 No score

MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.

Record: EUVD-2021-28806
Updated: 2026-11-03

GitHub AdvisoriesGHSA-6w7p-46mm-c2fc 6.1

MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being...

MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.

Record: GHSA-6w7p-46mm-c2fc
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness: CWE-79
Updated: 2026-11-02

OSV 6.1

MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.

Record: CVE-2021-41798
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-41798 6.1

MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.

Record: DEBIAN-CVE-2021-41798
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-41798 6.1

MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.

Record: UBUNTU-CVE-2021-41798
CVSS 3.1: 6.1 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated: 2026-11-02

OSVBIT-mediawiki-2021-41798 No score

MediaWiki before 1.36.2 allows XSS. Month related MediaWiki messages are not escaped before being used on the Special:Search results page.

Record: BIT-mediawiki-2021-41798
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
Package	Affected	Fixed
`mediawiki` Bitnami	before 1.36.2	1.36.2
`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:9 From an advisory covering 3 CVEs	before 1:1.27.7-1~deb9u10, plus listed versions 1:1.27.3-11:1.27.4-11:1.27.4-1~bpo8+11:1.27.4-1~deb9u11:1.27.4-2 Show 12 moreShow less 1:1.27.4-31:1.27.5-1~deb9u11:1.27.6-1~deb9u11:1.27.7-1~deb9u11:1.27.7-1~deb9u21:1.27.7-1~deb9u31:1.27.7-1~deb9u41:1.27.7-1~deb9u51:1.27.7-1~deb9u61:1.27.7-1~deb9u71:1.27.7-1~deb9u81:1.27.7-1~deb9u9	1:1.27.7-1~deb9u10
`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

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Affected packages
Package	Affected	Fixed
`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
`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
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2021-41798 is a medium vulnerability (CVSS 6.1) in Mediawiki, published October 1, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.44%, the 73rd percentile. Fixed in mediawiki 1.36.2.

References

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