CVE-2025-53496VulnerabilityPublished 7 Jul 2025Updated 31 Jul 2025

CVE-2025-53496: Wikimedia Foundation Mediawiki – MediaSearch Extension · XSS or 'Cross-site Scripting'

Affects Wikimedia Foundation Mediawiki – MediaSearch ExtensionSource CVE Database V5

Not known to be exploited · CVSS 5.4 Medium : upgrade to 1.44.0 or 1.43.0 when convenient.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

5.4Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 1.44.0, 1.43.0

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: Required
Scope: Changed
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 7 Jul 2025
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 2026-10-26.

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 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 Wikimedia Foundation Mediawiki – MediaSearch Extension to 1.44.0 or 1.43.0.

Affected software

Product	Affected	Fixed in
Wikimedia Foundation Mediawiki - MediaSearch Extension	Affected >=1.42.0 <1.43.0 >=1.43.0 <1.44.0 =1.42.0 =1.43.0 =1.44.0	Fixed in 1.43.0 1.44.0

AI-suggested

To mitigate this vulnerability effectively, European organizations should: 1) Immediately upgrade the MediaSearch Extension to versions 1.42.7 or later, or 1.43.2 or later, where the vulnerability is patched. 2) Conduct a thorough audit of all Mediawiki installations to identify instances of the vulnerable extension versions. 3) Implement strict input validation and output encoding on all user-supplied data within the MediaSearch Extension and related components to prevent injection of malicious scripts. 4) Enforce least privilege principles to limit user permissions, reducing the risk of exploitation by low-privilege users. 5) Educate users about the risks of interacting with untrusted content and encourage cautious behavior regarding links and inputs in the wiki environment. 6) Monitor logs and user activity for unusual patterns that may indicate attempted exploitation. 7) Consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting Mediawiki. 8) Regularly review and update security policies related to web application usage and patch management to ensure timely response to vulnerabilities.

Description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - MediaSearch Extension allows Stored XSS.This issue affects Mediawiki - MediaSearch Extension: from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.

Impact

For European organizations, the impact of this vulnerability can be substantial, especially for those using Mediawiki with the MediaSearch Extension for internal documentation, knowledge bases, or public-facing wikis. Exploitation could lead to unauthorized disclosure of sensitive information (confidentiality impact), manipulation of displayed content (integrity impact), and erosion of user trust. Since Mediawiki is often used in government, educational, and corporate environments across Europe, a successful attack could facilitate phishing, social engineering, or lateral movement within networks. The changed scope implies that the vulnerability could affect other components or users beyond the immediate extension, potentially broadening the attack surface. Although availability is not impacted, the confidentiality and integrity risks could lead to regulatory compliance issues under GDPR, reputational damage, and operational disruptions. The requirement for low privileges and user interaction means that insider threats or compromised accounts could be leveraged to exploit this vulnerability, increasing the risk profile for organizations with large user bases or less stringent access controls.

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #1OWASP Top 10 A05:2025: Injection (opens in a new tab)
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation · Architecture and Design
Understand the context in which your data will be used and the encoding that will be expected. This is especially important when transmitting data between different components, or when generating outputs that can contain multiple encodings at the same time, such as web pages or multi-part mail messages.
Architecture and Design · Implementation · Attack Surface Reduction
Understand all the potential areas where untrusted inputs can enter your software: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide…
OWASP Cheat Sheets
Cross Site Scripting Prevention (opens in a new tab)
DOM based XSS Prevention (opens in a new tab)
Injection Prevention (opens in a new tab)
Abuse Case (opens in a new tab)
Deserialization (opens in a new tab)
OWASP ASVS 4.0.3
V5.3.3 (opens in a new tab)
V1.5.1 (opens in a new tab)
Attack patterns
XSS Using MIME Type Mismatch (opens in a new tab)
DOM-Based XSS (opens in a new tab)
Reflected XSS (opens in a new tab)
Stored XSS (opens in a new tab)
Cross-Site Scripting (XSS) (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

Loading reviews…

Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 1 Aug 2025, 00:41 UTC

WeaknessesCWE-79

Technical details

References

Community reviews

Related threats