What is CVE-2026-0670?

CVE-2026-0670 is a medium-severity vulnerability in Wikimedia Foundation MediaWiki - Proofreadpage Extension, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-01-07.

How severe is CVE-2026-0670?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Wikimedia Foundation MediaWiki - Proofreadpage Extension

CVE-2026-0670

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows Cross-Site Scripting (XSS).This issue affects MediaWiki - ProofreadPage Extension: 1.45, 1.44, 1.43, 1.39.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-01-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (7.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Wikimedia Foundation MediaWiki - Proofreadpage Extension — versions 1.45, 1.44, 1.43
Wikisource Proofread Page — versions 1.39, 1.43, 1.44

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Exploit, Issue Tracking)
c4f26cc8-17ff-4c99-b5e2-38fc1793eacc (Patch)

Frequently asked questions

What is CVE-2026-0670?: CVE-2026-0670 is a medium-severity vulnerability in Wikimedia Foundation MediaWiki - Proofreadpage Extension, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-01-07.
How severe is CVE-2026-0670?: Medium severity. CVSS v3 base score is 6.1 out of 10.