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CVE Record

CVE-2021-36131: An XSS issue was discovered in the SportsTeams extension in MediaWiki through 1.36.

An XSS issue was discovered in the SportsTeams extension in MediaWiki through 1.36. Within several special pages, a privileged user could inject arbitrary HTML and JavaScript within various data fields. The attack could easily propagate across many pages for many users.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-36131 is a stored cross-site scripting issue in the MediaWiki SportsTeams extension through MediaWiki 1.36. A privileged user could place HTML or JavaScript into SportsTeams data fields, causing malicious content to appear across multiple special pages and users.

Executive priority

Prioritize if SportsTeams is used on an internal or public wiki with many readers or delegated editors. The issue is not KEV-listed, but stored XSS can undermine user trust and session safety.

Technical view

The issue affects the SportsTeams extension for MediaWiki through 1.36. Several special pages failed to adequately prevent privileged users from injecting arbitrary HTML and JavaScript into data fields, creating a stored XSS condition with broad page propagation. No CVSS score or CWE is provided in the source bundle.

Likely exposure

Exposure is likely limited to MediaWiki deployments that use the SportsTeams extension through MediaWiki 1.36, especially where multiple users hold privileges to manage SportsTeams data.

Exploitation context

The sources describe a privileged-user XSS path and broad propagation, but they do not cite public exploitation, weaponized exploit availability, or CISA KEV listing. Treat this as insider, compromised-admin, or delegated-editor risk.

Researcher notes

Evidence is sparse: the CVE text identifies the affected extension, privilege requirement, and propagation risk, while the references point to Wikimedia tracking and Gerrit remediation material. No source in the bundle provides CVSS, affected package metadata, or exploitation confirmation.

Mitigation direction

  • Inventory MediaWiki deployments using the SportsTeams extension through version 1.36.
  • Review Wikimedia task T281196 and linked Gerrit changes for vendor remediation guidance.
  • Apply the vendor-provided SportsTeams extension update or corrected code when confirmed.
  • Reduce SportsTeams data-edit privileges to trusted users only.
  • Review existing SportsTeams data fields for unauthorized HTML or JavaScript.

Validation and detection

  • Confirm whether the SportsTeams extension is installed and enabled.
  • Check MediaWiki and extension versions against the affected through-1.36 statement.
  • Verify whether the linked Gerrit remediation has been applied.
  • Inspect SportsTeams special pages for unexpected rendered markup or script behavior.
  • Review privileged account activity around SportsTeams data changes.
Prepared
Confidence
medium
Sources
4

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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CVE-2021-36131 mapping review

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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
3Source 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

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.