CVE-2020-35479: debian debian_linux Cross-site Scripting
Vulnerability summary
CVE-2020-35479 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in debian debian_linux. EPSS estimates a 1.49% chance of exploitation in the next 30 days, higher than 73.7% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 3Timeline
- 18-12-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
MediaWiki before 1.35.1 allows XSS via BlockLogFormatter.php. Language::translateBlockExpiry itself does not escape in all code paths. For example, the return of Language::userTimeAndDate is is always unsafe for HTML in a month value. This affects MediaWiki 1.12.0 and later.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
1.49%
Chance of exploitation in the next 30 days
Percentile
74%
Versus all other CVEs
30-day change
0.00 pp
From 1.49% on 21-09-2026
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< 1:1.35.1-1
- debian_linuxEOL9.0 | 10.0
Fedoraproject1 product
- fedoraEOL33
Mediawiki1 product
- mediawiki≥ 1.12.0, < 1.35.1
Ubuntu1 product
- mediawikiAll versions (No fix recorded)
4 vendors · 5 products
References
9 links- lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.htmlX Refsource MISCREPORTMailing ListRelease NotesVendor Advisory
- lists.debian.org/debian-lts-announce/2020/12/msg00034.htmlMailing ListX Refsource MLISTThird Party Advisory