CVE-2021-42047 json
An issue was discovered in the Growth extension in MediaWiki through 1.36.2.
published 2021-10-06 5 y ago modified 2026-06-17 4 mo ago also BIT-mediawiki-2021-42047 , EUVD-2021-29035
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 51%
- public exploits
- 0
- none known
Summary
An issue was discovered in the Growth extension in MediaWiki through 1.36.2. On any Wiki with the Mentor Dashboard feature enabled, users can login with a mentor account and trigger an XSS payload (such as alert) via Growthexperiments-mentor-dashboard-mentee-overview-no-js-fallback.
Patch / fix
- bitnami mediawiki 1.36.3
Exploit prediction
0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| OSV | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/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
/T289063
patch, vendor-advisory, web
-
gerrit.wikimedia.org
/r/c/mediawiki/extensions/GrowthExperiments/+/720088
patch, vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2021-42047
web
Sources
- CVE List CVE-2021-42047
- NVD CVE-2021-42047
- OSV BIT-mediawiki-2021-42047
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.