Cyber Resilience

CVE-2026-34095

Mediawiki ≤ 1.43.7

Published
11 May 2026
Modified
17 June 2026
Patch / advisory
View advisory
CVSS Score v4 0.0
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/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:X
EPSS Score 0.0020 10th percentile
Risk Priority 0 floored blend · peak EPSS

Summary

CVE-2026-34095 is a uncategorised-severity Exposure of Resource to Wrong Sphere (CWE-668) vulnerability in Mediawiki Mediawiki. Its CVSS base score is 0.0.

Operationally, ranked at the 10th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-3 (Access Enforcement) and AC-4 (Information Flow Enforcement) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability Data

Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/Actions/ActionEntryPoint.Php, includes/Request/FauxResponse.Php. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.

CWE(s)
CWE-668

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

Insufficient information to map techniques.
Confidence: LOW · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-34094Same product: Mediawiki Mediawiki
CVE-2026-8857Same product: Mediawiki Mediawiki
CVE-2025-61642Same product: Mediawiki Mediawiki
CVE-2023-36675Same product: Mediawiki Mediawiki
CVE-2026-58038Same product: Mediawiki Mediawiki
CVE-2025-67483Same product: Mediawiki Mediawiki
CVE-2026-58031Same product: Mediawiki Mediawiki
CVE-2023-45371Same product: Mediawiki Mediawiki
CVE-2026-58030Same product: Mediawiki Mediawiki
CVE-2024-23179Same product: Mediawiki Mediawiki

Affected Assets

mediawiki
mediawiki
≤ 1.43.7 · 1.44.0 — 1.44.4 · 1.45.0 — 1.45.2

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • AC-3 Access Enforcement
  • AC-4 Information Flow Enforcement
  • AC-6 Least Privilege
Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 8 hardening rules · 7 OS baselines
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

AC-3 Access Enforcement good match
prevent

Directly enforces access decisions on ActionEntryPoint requests to block exposure of resources outside their intended authorization sphere (CWE-668).

AC-4 Information Flow Enforcement good match
prevent

Enforces information flow rules between MediaWiki actions and FauxResponse objects so data is never released to unauthorized contexts.

AC-6 Least Privilege partial match
prevent

Restricts privileges on action execution paths, reducing the chance that an incorrectly exposed resource can be reached or abused.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-05 mostly match
prevents

Enforcing least-privilege authorizations directly prevents resources from being exposed outside their intended control sphere.

PR.IR-01 partial match
prevents

Network segmentation and unauthorized-access protections reduce the chance of resources being reachable by the wrong sphere.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.22 Segregation of networks partial match
mitigates

Placing systems of differing trust levels into separate domains prevents resources from being placed in a sphere where they are reachable by unintended actors.

A.5.9 Inventory of information and other associated assets none match
none

Requiring owners to manage the full asset life cycle and remove assets from the inventory upon secure disposal helps prevent resources from being inadvertently exposed outside their intended security sphere.

References