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CVE Record

CVE-2020-25814: In MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4, XSS related to jQuery can occur.

In MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4, XSS related to jQuery can occur. The attacker creates a message with [javascript:payload xss] and turns it into a jQuery object with mw.message().parse(). The expected result is that the jQuery object does not contain an <a> tag (or it does not have a href attribute, or it's empty, etc.). The actual result is that the object contains an <a href ="javascript... that executes when clicked.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-25814 is a MediaWiki cross-site scripting issue. A crafted message processed through MediaWiki's jQuery message parsing can leave a dangerous link in generated page content. If a user clicks it, script could run in that user's browser context. The sources do not provide a CVSS score or evidence of active exploitation.

Executive priority

Prioritize remediation for internet-facing or user-editable MediaWiki sites. The business risk is account-context script execution after user interaction, not confirmed mass exploitation. Patch during the next security maintenance window, faster for public collaborative wikis.

Technical view

MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4 mishandles jQuery message parsing via mw.message().parse(). The vulnerable behavior can preserve a javascript link where sanitization was expected to remove the anchor, href, or value. Impact depends on whether untrusted users can influence parsed messages and whether users interact with the rendered link.

Likely exposure

Exposure is most likely in MediaWiki deployments on affected versions, especially public or collaborative wikis where untrusted users can create or influence messages later parsed by mediawiki.jqueryMsg. The provided affected-product metadata is incomplete, so asset inventory should confirm MediaWiki version and usage paths.

Exploitation context

The bundle describes a crafted-message XSS condition but provides no KEV listing, exploit-in-the-wild claim, CVSS vector, or proof of broad weaponization. Treat it as a real browser-side security defect with incomplete public exploitation evidence.

Researcher notes

Evidence is limited to the CVE description and linked advisories. The key research question is whether attacker-controlled message content reaches mw.message().parse() in a target deployment. Avoid assuming impact for installations without such a path.

Mitigation direction

  • Upgrade MediaWiki to 1.31.10, 1.34.4, or a later supported fixed release.
  • Apply vendor or distribution MediaWiki security packages where installed through OS repositories.
  • Check Wikimedia and MediaWiki guidance for branch-specific upgrade instructions.
  • Review custom extensions using mw.message().parse() with untrusted message content.

Validation and detection

  • Inventory MediaWiki instances and record exact deployed versions.
  • Flag versions before 1.31.10 and 1.32.x through 1.34.x before 1.34.4.
  • Identify pages, extensions, or workflows that parse user-influenced messages with mediawiki.jqueryMsg.
  • Confirm patched package versions through application metadata or vendor package records.
Prepared
Confidence
medium
Sources
6

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
5Source 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.