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Critical

X-Forwarded-For header allows brute-forcing autoblocked IP addresses

  • Disclosed: 31.03.2023
  • Updated: 11.10.2026 10:22

An issue was discovered in MediaWiki before 1.35.10, 1.36.x through 1.38.x before 1.38.6, and 1.39.x before 1.39.3. An auto-block can occur for an untrusted X-Forwarded-For header.

Affected software

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PlatformPackageVulnerable versionsFixed in
Composer package mediawiki/core >= 1.39.0, < 1.39.3, >= 1.38.0, < 1.38.6, < 1.35.10 1.39.3, 1.38.6, 1.35.10

References

CVSS score 9.8/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-444
Platform
Composer
Package
mediawiki/core
Disclosed
31.03.2023
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-5vj8-g3qg-4qh6 - CC BY 4.0

Vulnerability history: mediawiki/core

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (28) in the archive
Total entries
28
First → latest
05.2022 10.2023
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 2
  • High 6
  • Medium 20

Disclosures per year

Severity:
  1. MediaWiki Denial of Service vulnerability
    High · 7.5 CVE-2023-45363 < 1.35.12, >= 1.36.0, < 1.39.5, >= 1.40.0, < 1.40.1 1.35.12, 1.39.5, 1.40.1
  2. X-Forwarded-For header allows brute-forcing autoblocked IP addresses this entry
    Critical · 9.8 CVE-2023-29141 >= 1.39.0, < 1.39.3, >= 1.38.0, < 1.38.6, < 1.35.10 1.39.3, 1.38.6, 1.35.10
  3. OATHAuth extension in MediaWiki is not implementing rate limit
    High · 7.5 CVE-2020-25827 >= 1.31.0, < 1.31.9, >= 1.32.0, < 1.34.3 1.31.9, 1.34.3
  4. Wikimedia information leak vulnerability
    High · 7.5 CVE-2019-12474 >= 1.27.0, < 1.27.6, >= 1.30.0, < 1.30.2, >= 1.31.0, < 1.31.2, >= 1.32.0, < 1.32.2 1.27.6, 1.30.2, 1.31.2, 1.32.2
  5. Wikimedia Potential DOS due to slow WatchedItemStore::countVisitingWatchersMultiple
    High · 7.5 CVE-2019-12473 >= 1.27.0, < 1.27.6, >= 1.30.0, < 1.30.2, >= 1.31.0, < 1.31.2, >= 1.32.0, < 1.32.2 1.27.6, 1.30.2, 1.31.2, 1.32.2
  6. MediaWiki Incorrect Access Control vulnerability
    High · 7.5 CVE-2019-12472 >= 1.18.0, < 1.27.6, >= 1.30.0, < 1.30.2, >= 1.31.0, < 1.31.2, >= 1.32.0, < 1.32.2 1.27.6, 1.30.2, 1.31.2, 1.32.2
  7. Wikimedia MediaWiki allows CSRF
    High · 8.8 CVE-2019-12466 >= 1.27.0, < 1.27.6, >= 1.30.0, < 1.30.2, >= 1.31.0, < 1.31.2, >= 1.32.0, < 1.32.2 1.27.6, 1.30.2, 1.31.2, 1.32.2
  8. Wikimedia MediaWiki Incorrect Access Control vulnerability
    Critical · 9.8 CVE-2019-12468 >= 1.27.0, < 1.27.6, >= 1.30.0, < 1.30.2, >= 1.31.0, < 1.31.2, >= 1.32.0, < 1.32.2 1.27.6, 1.30.2, 1.31.2, 1.32.2

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