CVE-2021-30153
When using VisualEditor to edit a MediaWiki user page belonging to an existing, but hidden, user, VisualEditor will disclose that the user exists.
Does this matter?
Lower severity and a low EPSS score (0.83%). Track it; it rarely justifies an emergency change on its own.
Description
An issue was discovered in the VisualEditor extension in MediaWiki before 1.31.13, and 1.32.x through 1.35.x before 1.35.2. . When using VisualEditor to edit a MediaWiki user page belonging to an existing, but hidden, user, VisualEditor will disclose that the user exists. (It shouldn't because they are hidden.) This is related to ApiVisualEditor.
- CVSS 3.1
- 4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 0.83% probability · 57th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-668
- Affected
- mediawiki/mediawiki
- Source
- cve@mitre.org
EPSS 0.8% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://lists.wikimedia.org/hyperkitty/list/wikitech-l%40lists.wikimedia.org/message/XYBF5RSTJRMVCP7QBYK7643W75A3KCIY/
- https://lists.wikimedia.org/pipermail/wikitech-l/2021-April/094418.htmlMailing List, Patch, Vendor Advisory
- https://phabricator.wikimedia.org/T270453Exploit, Vendor Advisory
- https://lists.wikimedia.org/hyperkitty/list/wikitech-l%40lists.wikimedia.org/message/XYBF5RSTJRMVCP7QBYK7643W75A3KCIY/
- https://lists.wikimedia.org/pipermail/wikitech-l/2021-April/094418.htmlMailing List, Patch, Vendor Advisory
- https://phabricator.wikimedia.org/T270453Exploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.