6.5

CVE-2021-44857: mediawiki Missing Authorization

CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2021-44857DEBIAN-CVE-2021-44857
Published 17-12-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-44857 is a medium (CVSS 6.5) Missing Authorization vulnerability in mediawiki. EPSS estimates a 0.90% chance of exploitation in the next 30 days, higher than 59.1% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.90%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2
DSA-5021-1MGASA-2021-0568

Timeline

  1. 17-12-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last 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. It is possible to use action=mcrundo followed by action=mcrrestore to replace the content of any arbitrary page (that the user doesn't have edit rights for). This applies to any public wiki, or a private wiki that has at least one page set in $wgWhitelistRead.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.90%

Chance of exploitation in the next 30 days

Percentile

59%

Versus all other CVEs

30-day change

+0.03 pp

From 0.87% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.90%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • mediawiki< 1:1.35.5-1
Mediawiki1 product
  • mediawiki< 1.35.5 | ≥ 1.36.0, < 1.36.3 | ≥ 1.37.0, < 1.37.1
Ubuntu1 product
  • mediawiki< 1:1.35.5-1

3 vendors · 3 products

References

8 links