Security readout for executives and security teams
Plain-English summary
CVE-2026-0670 is a stored cross-site scripting issue in Wikimedia MediaWiki’s ProofreadPage extension. A malicious value can be stored and later executed in another user’s browser when they view affected content. Business impact is mainly account/session risk and content trust degradation on sites using the affected extension versions.
Executive priority
Treat as a timely patching and exposure-validation item, not an emergency unless public-facing wikis allow broad content contribution. Prioritize sites with external users, anonymous editing, or sensitive authenticated sessions.
Technical view
The CVE describes CWE-79 improper input neutralization during web page generation in MediaWiki ProofreadPage. It involves a system message and user-provided parameter. Affected versions listed are 1.45, 1.44, 1.43, and 1.39. CVSS 3.1 is 6.1: network reachable, low complexity, no privileges, user interaction required, changed scope, low confidentiality and integrity impact.
Likely exposure
Exposure is limited to MediaWiki deployments running the ProofreadPage extension in affected versions: 1.45, 1.44, 1.43, or 1.39. Sites not using this extension are not indicated as affected by the provided sources.
Exploitation context
No cited source or KEV entry indicates active exploitation. Exploitation requires a victim to interact with or view affected generated content. Because it is stored XSS, impact can persist until the malicious stored content or vulnerable behavior is removed.
Researcher notes
The public record names affected branches but does not provide fixed version numbers in the supplied data. Gerrit and Phabricator references should be reviewed for patch lineage and backport status. Avoid assuming exploitation in the wild without additional evidence.
Mitigation direction
- Identify MediaWiki instances using the ProofreadPage extension.
- Check whether ProofreadPage is version 1.45, 1.44, 1.43, or 1.39.
- Review Wikimedia Phabricator and Gerrit references for vendor remediation status.
- Apply vendor-provided security updates or backports when available.
- Remove or sanitize suspicious stored content related to affected ProofreadPage pages.
- Restrict editing or message modification access until remediation is confirmed.
Validation and detection
- Inventory all MediaWiki deployments and enabled extensions.
- Confirm installed ProofreadPage versions against the affected version list.
- Review vendor advisory references for fixed release or patch availability.
- Check web logs and page histories for suspicious ProofreadPage-related edits.
- Verify user-generated values are safely encoded after applying vendor fixes.
- Confirm no untrusted script execution occurs during normal page viewing.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-0670 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://phabricator.wikimedia.org/T409423CVE reference
- https://gerrit.wikimedia.org/r/q/I7c028db5ed81843aacd596b0ee4dc2980f5b6e3cCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.