CVE-2021-44856: mediawiki
CVSS: 5.3v3.1MediumModified
AliasesUBUNTU-CVE-2021-44856DEBIAN-CVE-2021-44856
Published 26-12-2022Last modified 14-04-2025
Vulnerability summary
CVE-2021-44856 is a medium (CVSS 5.3) vulnerability in mediawiki. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 42% of scored vulnerabilities.
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)EPSS score
0.51%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 3Timeline
- 26-12-2022PublishedVulnerability first disclosed.
- 14-04-2025Last modifiedVulnerability information updated.
Description
An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. A title blocked by AbuseFilter can be created via Special:ChangeContentModel due to the mishandling of the EditFilterMergedContent hook return value.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 5.3Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- OSV · DebianEcosystem advisory · calculated5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS trend
Probability
0.51%
Chance of exploitation in the next 30 days
Percentile
42%
Versus all other CVEs
30-day change
+0.01 pp
From 0.49% on 20-09-2026
20-09-202620-10-2026
EPSS score0.51%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- mediawiki< 1:1.35.5-1
Mediawiki1 product
- mediawikiEOL< 1.35.5 | ≥ 1.36.0, < 1.36.3 | 1.37.0 | 1.37.0:rc0 | 1.37.0:rc1 | 1.37.0:rc2
Ubuntu1 product
- mediawikiAll versions (No fix recorded)
3 vendors · 3 products
