CVE-2023-45361Network attack vector

Page-rendering crash via uncaught malformed title exception

Published Oct 9, 2024 · Updated Mar 13, 2025

Improper exception handling in MediaWiki Vector before 1.39.5 and in 1.40.0 allows attackers to interrupt page rendering via a malformed message. VectorComponentUserLinks interprets the vector-intro-page system message as a title without catching MalformedTitleException, so an invalid value crashes rendering. Reachability requires control of that message and a request rendered with Vector; affected requests fail instead of producing a normal page.

CVSS severity6.1
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper exception handling in MediaWiki Vector before 1.39.5 and in 1.40.0 allows attackers to interrupt page rendering via a malformed message. VectorComponentUserLinks interprets the vector-intro-page system message as a title without catching MalformedTitleException, so an invalid value crashes rendering. Reachability requires control of that message and a request rendered with Vector; affected requests fail instead of producing a normal page.

The record

CVE
CVE-2023-45361
Published
Oct 9, 2024
Updated
Mar 13, 2025
Vendor
Wikimedia Foundation
Product
MediaWiki
Classifications
Unavailable
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=0 <1.40.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Wikimedia Foundation · MediaWikiversion=0 <1.40.1

Published CVSS scores

6.1CISA-ADPCVSS: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.

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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Technologies

Your stack

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Your stack

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