CVE-2026-39838

mediumpriority · track · 0EPSS 0.004 · 34 %ileDEEU

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.40% (34th) EPSS

CVSS 6.9 · medium

Is it mine?

15 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · cert_bund

EPSS · scored 2026-10-27

Improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Wikimedia Foundation MediaWiki - ProofreadPage Extension allows XSS Targeting Non-Script Elements. The issue has been remediated on the `master` branch, and in the release branches for MediaWiki versions 1.43, 1.44, and 1.45.

cvss

Technical severity, 0–10. One row per scoring source.

6.9

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.7–6.9

v4.06.9mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:Nsecondary · ENISA EU

v4.06.9mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary

v4.02.7lowCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79US

affected products (15)

Products and version ranges known to be affected.

Open Source MediaWiki <1.43.7all versionscert_bundDE
Open Source MediaWiki <1.44.4all versionscert_bundDE
Open Source MediaWiki <1.45.2all versionscert_bundDE
Open Source MediaWiki CampaignEvents Extensionall versionscert_bundDEcpe:/a:mediawiki:mediawiki:campaignevents_extension
Open Source MediaWiki Cargo extensionall versionscert_bundDEcpe:/a:mediawiki:mediawiki:cargo_extension
Open Source MediaWiki CentralAuth Extensionall versionscert_bundDEcpe:/a:mediawiki:mediawiki:centralauth__extension
Open Source MediaWiki GrowthExperiments Extensionall versionscert_bundDEcpe:/a:mediawiki:mediawiki:growthexperiments_extension
Open Source MediaWiki ProofreadPage Extensionall versionscert_bundDEcpe:/a:mediawiki:mediawiki:proofreadpage_extension
Open Source MediaWiki ReportIncident Extensionall versionscert_bundDEcpe:/a:mediawiki:mediawiki:reportincident__extension
Open Source MediaWiki Score Extensionall versionscert_bundDEcpe:/a:mediawiki:mediawiki:score_extension
Open Source MediaWiki Wikilove Extensionall versionscert_bundDEcpe:/a:mediawiki:mediawiki:wikilove_extension
Open Source MediaWiki< 1.43.7cert_bundDE
Open Source MediaWiki< 1.44.4cert_bundDE
Open Source MediaWiki< 1.45.2cert_bundDE
Wikimedia Foundation MediaWiki - ProofreadPage Extension0 → 1.43enisa_euvdEU

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1043MediaWiki Erweiterungen: Mehrere Schwachstellen ermöglichen Cross-Site ScriptingDeutsch2026-04-09csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in MediaWiki Extensions ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund NVD CVE.org MITRE

published 2026-04-07modified 2026-07-21

references (6)

External citations — patches, advisories, analysis.

scry

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