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CVE Record

CVE-2021-36128: An issue was discovered in the CentralAuth extension in MediaWiki through 1.36.

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

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This issue affects MediaWiki installations using the CentralAuth extension through version 1.36. CentralAuth-issued suppression blocks did not properly apply autoblocks, which could weaken an administrative control intended to limit further abusive activity after a suppression block.

Executive priority

Treat as a targeted platform-control weakness rather than a clearly quantified emergency. Prioritize if CentralAuth is used for trust, safety, or abuse response across multiple wikis.

Technical view

CVE-2021-36128 describes incorrect implementation of autoblocks for CentralAuth-issued suppression blocks in MediaWiki CentralAuth through 1.36. The source bundle does not provide CVSS, CWE, detailed impact boundaries, or a named fixed release. Wikimedia task and Gerrit references indicate the issue was tracked and code changes exist.

Likely exposure

Exposure is most likely for MediaWiki deployments using the CentralAuth extension through 1.36, especially multi-wiki environments relying on suppression blocks and autoblocks for abuse control.

Exploitation context

No KEV listing or supplied source states active exploitation. Public issue and Gerrit references exist, but the bundle does not include exploit details, impact measurements, or evidence of weaponization.

Researcher notes

Evidence is limited to the CVE summary and Wikimedia tracking references. There is no supplied CVSS, CWE, fixed version, exploit status, or detailed root-cause narrative, so validation should stay source-grounded and deployment-specific.

Mitigation direction

  • Check Wikimedia guidance for the affected CentralAuth release and applicable update path.
  • Update MediaWiki/CentralAuth according to vendor-maintained releases or patches that include the referenced fixes.
  • Limit suppression and CentralAuth block privileges to trusted administrators.
  • Review moderation workflows for manual handling where autoblocks may not have applied.
  • Monitor block and abuse logs for suppression-block follow-up gaps.

Validation and detection

  • Inventory MediaWiki instances using CentralAuth and identify versions through 1.36.
  • Compare deployed CentralAuth code with the referenced Wikimedia Gerrit changes.
  • Review historical suppression blocks for expected autoblock outcomes.
  • Confirm staging behavior matches policy for CentralAuth-issued suppression blocks.
  • Document whether compensating controls cover any delayed update window.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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