CVE-2021-44855: mediawiki Cross-site Scripting
CVSS: 5.4v3.1MediumModified
AliasesUBUNTU-CVE-2021-44855DEBIAN-CVE-2021-44855
Published 26-12-2022Last modified 14-04-2025
Vulnerability summary
CVE-2021-44855 is a medium (CVSS 5.4) Cross-site Scripting vulnerability in mediawiki. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.2% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
5.4/10
010
Medium · v3.1 (CVE.org)EPSS score
0.57%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 2Timeline
- 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. There is Blind Stored XSS via a URL to the Upload Image feature.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 5.4Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:NSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated5.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- OSV · DebianEcosystem advisory · calculated5.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- NVDNIST5.4MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
0.57%
Chance of exploitation in the next 30 days
Percentile
46%
Versus all other CVEs
30-day change
+0.01 pp
From 0.56% on 21-09-2026
21-09-202621-10-2026
EPSS score0.57%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (phabricator.wikimedia.org)
Maturity: unknown
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
