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No exploitation reportedFix available

CVE-2021-36128

No exploitation reported by the sources we read.

  • Published2021-07-02
  • WeaknessCWE-755

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in the CentralAuth extension in MediaWiki through 1.36. Autoblocks for CentralAuth-issued suppression blocks are not properly implemented.

Timeline

dates in UTC
  1. 2021-07-0213:15CVE publishedNVD

Versions per branch

NVD · OSV
Mediawiki
BranchAffectedFixed in
1.36≤ 1.36no fix published
mediawiki
BranchAffectedFixed in
1.36< 1.36.11.36.1

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-07-02
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-v83p-2pcp-wwg6

Frequently asked questions

What is CVE-2021-36128?

An issue was discovered in the CentralAuth extension in MediaWiki through 1.36. Autoblocks for CentralAuth-issued suppression blocks are not properly implemented.

Is CVE-2021-36128 actively exploited?

Active exploitation of CVE-2021-36128 has not been confirmed. Its EPSS score was 1.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-36128?

CVE-2021-36128 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record