CVE-2021-42041 json
An issue was discovered in CentralAuth in MediaWiki through 1.36.2.
published 2021-10-06 5 y ago modified 2026-06-17 4 mo ago also BIT-mediawiki-2021-42041 , EUVD-2021-29029
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 62%
- public exploits
- 0
- none known
Summary
An issue was discovered in CentralAuth in MediaWiki through 1.36.2. The rightsnone MediaWiki message was not being properly sanitized and allowed for the injection and execution of HTML and JavaScript via the setchange log.
Patch / fix
- bitnami mediawiki 1.36.3
Exploit prediction
0.98% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- phabricator.wikimedia.org https://phabricator.wikimedia.org/T291696 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
| OSV | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | mediawiki | <1.36.3 |
1.36.3 |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
phabricator.wikimedia.org
/T291696
exploit, patch, vendor-advisory, web
-
gerrit.wikimedia.org
/r/q/I7aeaa6e4de5ccaa5eeb6bf4fb00c96b01d5fea35
patch, vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2021-42041
web
Sources
- CVE List CVE-2021-42041
- NVD CVE-2021-42041
- OSV BIT-mediawiki-2021-42041
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.