CVE-2021-42048 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-2021-42048 , EUVD-2021-29036
- cvss
- 4.8
- 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. Any admin can add arbitrary JavaScript code to the Newcomer home page footer, which can be executed by viewers with zero edits.
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 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N |
| OSV | 3.1 | 4.8 | CVSS:3.1/AV:N/AC:L/PR:H/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
/T289064
patch, vendor-advisory, web
-
gerrit.wikimedia.org
/r/q/Iaa90a8976834d70caad592e9d1b18510318db537
patch, vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2021-42048
web
Sources
- CVE List CVE-2021-42048
- NVD CVE-2021-42048
- OSV BIT-mediawiki-2021-42048
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.