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CVE-2020-10960

MediaWiki makeCollapsible allows applying event handler to any CSS selector

5.3 MediumFix available

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

1.15%Up 0.5 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 5.3

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

Record
CVE-2020-10960
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:P/A:N
Weakness
CWE-74
Updated
2026-11-02
CVE List No score

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

Record
CVE-2020-10960
Updated
2026-11-02
EUVDEUVD-2022-4752 No score

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

Record
EUVD-2022-4752
Updated
2026-11-03
GitHub AdvisoriesGHSA-pfm2-mqwj-ggm5 5.3

MediaWiki makeCollapsible allows applying event handler to any CSS selector

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

Record
GHSA-pfm2-mqwj-ggm5
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-74, CWE-116
Updated
2026-11-02
OSV 5.3

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

Record
CVE-2020-10960
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2020-10960 5.3

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

Record
DEBIAN-CVE-2020-10960
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
Show 4 moreShow less
OSVGHSA-pfm2-mqwj-ggm5 5.3

MediaWiki makeCollapsible allows applying event handler to any CSS selector

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

Record
GHSA-pfm2-mqwj-ggm5
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-116, CWE-74
Updated
2026-11-02
OSVUBUNTU-CVE-2020-10960 5.3

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

Record
UBUNTU-CVE-2020-10960
CVSS 3.1
5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVBIT-mediawiki-2020-10960 No score

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

Record
BIT-mediawiki-2020-10960
Updated
2026-11-02
OSVMGASA-2020-0167 No score

Updated mediawiki packages fix security vulnerability

Updated mediawiki packages fix security vulnerability:

In MediaWiki before 1.31.7, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS) (CVE-2020-10960).

Record
MGASA-2020-0167
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mediawiki/core
Packagist
 1.31.0 up to 1.31.7
1.31.7
mediawiki/core
Packagist
 1.33.0 up to 1.33.3
1.33.3
mediawiki/core
Packagist
 1.34.0 up to 1.34.1
1.34.1
mediawiki
Bitnami
 before 1.34.1
1.34.1
mediawiki
Debian:12
 before 1:1.31.7-1
1:1.31.7-1
mediawiki
Debian:13
 before 1:1.31.7-1
1:1.31.7-1
mediawiki
Debian:14
 before 1:1.31.7-1
1:1.31.7-1
mediawiki
Debian:10
 before 1:1.31.7-1~deb10u1, plus listed versions
1:1.31.2-11:1.31.4-11:1.31.4-1~deb10u11:1.31.5-11:1.31.5-21:1.31.5-31:1.31.6-11:1.31.6-1~deb10u1
1:1.31.7-1~deb10u1
mediawiki/core
Packagist
 1.31.0 up to 1.31.7, plus listed versions
1.31.11.31.21.31.31.31.41.31.51.31.6
1.31.7
mediawiki/core
Packagist
 1.33.0 up to 1.33.3, plus listed versions
1.33.11.33.2
1.33.3
mediawiki
Mageia:7
 before 1.31.7-1.mga7
1.31.7-1.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

History

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

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

In short

CVE-2020-10960 is a medium vulnerability (CVSS 5.3) in Mediawiki, published April 2, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.15%, the 67th percentile. Fixed in mediawiki/core 1.31.7.

References

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