CVE-2026-34095Public exploitNetwork attack vector

Session script execution via dropped response headers

Published May 11, 2026 · Updated May 11, 2026

Cross-site scripting in affected MediaWiki releases allows attackers to run JavaScript in a logged-in user's session through an action=raw link. ActionEntryPoint resolves a Special:MyPage redirect through a DerivativeRequest whose FauxResponse does not forward RawAction's content-type headers, returning raw page text as text/html. Attackers must place crafted text on a victim-accessible user subpage and induce the logged-in victim to open the link, which executes the text in the wiki's origin.

CVSS severity6.1
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in affected MediaWiki releases allows attackers to run JavaScript in a logged-in user's session through an action=raw link. ActionEntryPoint resolves a Special:MyPage redirect through a DerivativeRequest whose FauxResponse does not forward RawAction's content-type headers, returning raw page text as text/html. Attackers must place crafted text on a victim-accessible user subpage and induce the logged-in victim to open the link, which executes the text in the wiki's origin.

The record

CVE
CVE-2026-34095
Published
May 11, 2026
Updated
May 11, 2026
Vendor
Wikimedia Foundation
Product
MediaWiki
Classifications
CWE-668, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 11, 2026CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=* <1.43.7, 1.44.4, 1.45.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wikimedia Foundation · MediaWikiversion=* <1.43.7, 1.44.4, 1.45.2

Published CVSS scores

0.0Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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