CVE-2026-34088Network attack vector

Suppressed content disclosure via RecentChanges log HTML

Published May 11, 2026 · Updated May 11, 2026

Information disclosure in Wikimedia Foundation MediaWiki before 1.43.7, 1.44.4, and 1.45.2 allows remote attackers to read suppressed content. The RecentChanges renderer generates log-entry HTML containing content marked as suppressed instead of substituting a visibility-safe representation. Exposure requires a suppressed log entry to be present and affects confidentiality only; no ability to alter data or interrupt service is reported.

CVSS severity7.5
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Wikimedia Foundation MediaWiki before 1.43.7, 1.44.4, and 1.45.2 allows remote attackers to read suppressed content. The RecentChanges renderer generates log-entry HTML containing content marked as suppressed instead of substituting a visibility-safe representation. Exposure requires a suppressed log entry to be present and affects confidentiality only; no ability to alter data or interrupt service is reported.

The record

CVE
CVE-2026-34088
Published
May 11, 2026
Updated
May 11, 2026
Vendor
Wikimedia Foundation
Product
MediaWiki
Classifications
CWE-200, T1213
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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
1.3Wikimedia FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U

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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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