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CVE-2020-25812

MediaWiki Cross-site Scripting (XSS) vulnerability

6.1 MediumFix available

An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.

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

1.10%Up 0.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 6.1

An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.

Record
CVE-2020-25812
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

An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.

Record
CVE-2020-25812
Updated
2026-11-02
EUVDEUVD-2022-5186 No score

An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.

Record
EUVD-2022-5186
Updated
2026-11-03
GitHub AdvisoriesGHSA-rj9p-8jxj-2ch4 6.1

MediaWiki Cross-site Scripting (XSS) vulnerability

An issue was discovered in MediaWiki 1.34.x before 1.34.3. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.

Record
GHSA-rj9p-8jxj-2ch4
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

An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.

Record
CVE-2020-25812
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-2020-25812 6.1

An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.

Record
DEBIAN-CVE-2020-25812
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
Show 4 moreShow less
OSVGHSA-rj9p-8jxj-2ch4 6.1

MediaWiki Cross-site Scripting (XSS) vulnerability

An issue was discovered in MediaWiki 1.34.x before 1.34.3. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.

Record
GHSA-rj9p-8jxj-2ch4
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
OSVUBUNTU-CVE-2020-25812 6.1

An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.

Record
UBUNTU-CVE-2020-25812
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-2020-25812 No score

An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.

Record
BIT-mediawiki-2020-25812
Updated
2026-11-02
OSVMGASA-2020-0381 No score

Updated mediawiki packages fix security vulnerability

Multiple security issues were discovered in MediaWiki: SpecialUserRights could leak whether a user existed or not, multiple code paths lacked HTML sanitisation allowing for cross-site scripting and TOTP validation applied insufficient rate limiting against brute force attempts (CVE-2020-25812, CVE-2020-25813, CVE-2020-25814, CVE-2020-25815, CVE-2020-25827, CVE-2020-25828).

Possible issues with actors not being loaded from the correct database or wiki (CVE-2020-25869).

Record
MGASA-2020-0381
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mediawiki/core
Packagist
 1.34.0 up to 1.34.3
1.34.3
mediawiki/core
Packagist
 1.35.0-rc.0 up to 1.35.0
1.35.0
mediawiki
Bitnami
 1.34.0 up to 1.34.4
1.34.4
mediawiki
Debian:12
 before 1:1.35.0-1
1:1.35.0-1
mediawiki
Debian:13
 before 1:1.35.0-1
1:1.35.0-1
mediawiki
Debian:14
 before 1:1.35.0-1
1:1.35.0-1
mediawiki
Debian:10
From an advisory covering 8 CVEs
 before 1:1.31.10-1~deb10u1, plus listed versions
1:1.31.2-11:1.31.4-11:1.31.4-1~deb10u11:1.31.5-11:1.31.5-2
Show 6 moreShow less
1:1.31.5-31:1.31.6-11:1.31.6-1~deb10u11:1.31.7-11:1.31.7-1~deb10u11:1.31.8-1
1:1.31.10-1~deb10u1
mediawiki/core
Packagist
 1.34.0 up to 1.34.3, plus listed versions
1.34.11.34.2
1.34.3
mediawiki/core
Packagist
 1.35.0-rc.0 up to 1.35.0, plus listed versions
1.35.0-rc.11.35.0-rc.21.35.0-rc.3
1.35.0
mediawiki
Mageia:7
From an advisory covering 7 CVEs
 before 1.31.10-1.mga7
1.31.10-1.mga7
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

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-2020-25812 is a medium vulnerability (CVSS 6.1) in Mediawiki, published September 25, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.10%, the 65th percentile. Fixed in mediawiki/core 1.34.3.

References

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