VulnerabilityPublished 3 Nov 2023Updated 4 Nov 2025

CVE-2023-45362: mediawiki · CVE-2023-45362 is an information leak

Affects mediawikiSource CVE Database V5

Not known to be exploited · fixed in 1.40.1 : update mediawiki when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated Medium by the CNA (mitre) · No CVSS score from NVD or the CNA

EPSS: 0.7% chance of exploitation in 30 days – higher than 55% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 1.40.1, 1.39.5, 1.35.12

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Nov 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade mediawiki/mediawiki to 1.40.1, 1.39.5 or 1.35.12.

Affected software

Product	Affected	Fixed in
Packagistmediawiki/mediawiki`pkg:composer/mediawiki/mediawiki`Other threats	Affected <1.35.12 >=1.36.0 <1.39.5 >=1.40.0 <1.40.1	Fixed in 1.35.12 1.39.5 1.40.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Fixed versions are available: 1.35.12, 1.39.5, and 1.40.1. Users should upgrade to these versions or later to remediate the vulnerability. No additional mitigation steps are indicated.

Description

CVE-2023-45362 is an information leak vulnerability in MediaWiki's DifferenceEngine.php component. It affects versions prior to 1.35.12, versions from 1.36.0 up to but excluding 1.39.5, and versions from 1.40.0 up to but excluding 1.40.1. The flaw causes intermediate revisions by the same user to ignore username suppression, potentially exposing user information that should be hidden.

Impact

The impact is an information disclosure where usernames intended to be suppressed in revision histories are instead revealed. This could lead to privacy concerns or unintended exposure of user activity data. There is no indication of active exploitation in the wild or more severe impacts such as code execution or privilege escalation.

Summary

The vulnerability in MediaWiki's DifferenceEngine.php allows intermediate revisions made by the same user to bypass username suppression controls, resulting in an information leak. This affects multiple version ranges before the respective fixed releases 1.35.12, 1.39.5, and 1.40.1. The issue is specifically related to the handling of revision differences and username suppression in the software.

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Oct 2026, 22:28 UTC

Technical details

References

Community reviews

Related threats