CVE-2021-35197: debian debian_linux Incorrect Authorization
Vulnerability summary
CVE-2021-35197 is a high (CVSS 7.5) Incorrect Authorization vulnerability in debian debian_linux. EPSS estimates a 1.94% chance of exploitation in the next 30 days, higher than 79.8% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 2Timeline
- 02-07-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
In MediaWiki before 1.31.15, 1.32.x through 1.35.x before 1.35.3, and 1.36.x before 1.36.1, bots have certain unintended API access. When a bot account has a "sitewide block" applied, it is able to still "purge" pages through the MediaWiki Action API (which a "sitewide block" should have prevented).
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
1.94%
Chance of exploitation in the next 30 days
Percentile
80%
Versus all other CVEs
30-day change
0.00 pp
From 1.94% on 20-09-2026
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
Debian2 products
- mediawiki< 1:1.35.3-1
- debian_linuxEOL9.0 | 10.0 | 11.0
Mageia2 products
- mediawiki< 1.31.15-1.mga7
- mediawiki< 1.35.3-1.1.mga8
Fedoraproject1 product
- fedoraEOL33 | 34 | 35
Mediawiki1 product
- mediawiki< 1.31.15 | ≥ 1.32.0, < 1.35.3 | ≥ 1.36.0, < 1.36.1
Ubuntu1 product
- mediawikiAll versions (No fix recorded)
5 vendors · 7 products
References
16 links- lists.wikimedia.org/hyperkitty/…X Refsource CONFIRM
- lists.debian.org/debian-lts-announce/2021/10/msg00003.htmlMailing ListX Refsource MLISTThird Party Advisory