7.5

CVE-2021-44858: mediawiki Incorrect Default Permissions

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2021-44858DEBIAN-CVE-2021-44858DLA-2847-1
Published 20-12-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-44858 is a high (CVSS 7.5) Incorrect Default Permissions vulnerability in mediawiki. EPSS estimates a 1.37% chance of exploitation in the next 30 days, higher than 71.5% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.37%
0%100%
Low · +0.04 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. 20-12-2021
    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=edit&undo= followed by action=mcrundo and action=mcrrestore to view private pages on a private wiki that has at least one page set in $wgWhitelistRead.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.37%

Chance of exploitation in the next 30 days

Percentile

72%

Versus all other CVEs

30-day change

+0.04 pp

From 1.33% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.37%

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 | < 1:1.27.7-1+deb9u11
Mediawiki1 product
  • mediawiki< 1.35.5 | ≥ 1.36.0, < 1.36.3 | ≥ 1.37.0, < 1.37.1
Ubuntu1 product
  • mediawikiAll versions (No fix recorded)

3 vendors · 3 products

References

7 links