LiveActive security incident?Get immediate response
CVE Record

CVE-2020-25869: An information leak was discovered in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4.

An information leak was discovered in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. Handling of actor ID does not necessarily use the correct database or correct wiki.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2020-25869 is an information leak in MediaWiki versions before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. The issue involves actor ID handling that may reference the wrong database or wiki, creating a risk that information from another wiki context is exposed.

Executive priority

Schedule remediation through normal vulnerability management unless the organization hosts sensitive private wikis or multiwiki environments. In those cases, prioritize faster patching because the flaw concerns information crossing wiki/database boundaries.

Technical view

MediaWiki actor ID handling did not necessarily use the correct database or wiki. In affected versions, actor-related lookups could cross the intended wiki/database boundary, causing information disclosure. The source bundle does not provide CVSS, CWE, detailed impact scope, or exploit mechanics.

Likely exposure

Organizations running affected MediaWiki versions, especially multiwiki or wiki-farm deployments, are the likely exposure group. Fedora-packaged MediaWiki users should also check the referenced Fedora advisory. Exposure is less clear for single-wiki deployments because the bundle does not describe exact triggering conditions.

Exploitation context

The source bundle does not show CISA KEV listing, active exploitation, public exploit availability, or weaponized details. Treat this as a disclosed information-leak flaw with incomplete public severity data rather than confirmed active attack activity.

Researcher notes

The core signal is actor ID context confusion: correct database/wiki selection was not guaranteed. Public evidence is sparse: no CVSS, CWE, exploitation status, or detailed proof path is provided in the bundle. Avoid assuming remote exploitability beyond the stated information leak.

Mitigation direction

  • Inventory MediaWiki instances and record exact versions.
  • Upgrade affected MediaWiki branches to non-vulnerable releases, including 1.31.10 or 1.34.4 where applicable.
  • Review Wikimedia and Fedora advisories for deployment-specific package guidance.
  • Prioritize multiwiki deployments where database or wiki context separation matters.
  • Check vendor guidance if running unsupported or distribution-patched versions.

Validation and detection

  • Confirm no MediaWiki instance runs before 1.31.10 on the 1.31 branch.
  • Confirm no 1.32.x through 1.34.x instance runs before 1.34.4.
  • Identify multiwiki configurations and actor-related extensions or integrations.
  • Review access logs for unusual actor or user metadata lookups if available.
  • Verify distribution packages include the referenced security update.
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

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

description · low confidence lookup

Database behavior lookup

The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2020-25869 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
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.