According to its self-reported version number, the instance of MediaWiki hosted on the remote web server is prior to 1.39.13, 1.42.x prior to 1.42.7 or 1.43.x prior to 1.43.2. It is, therefore, affected by a number of vulnerabilities as follows.

- Failure to escape the newpage message in FeedUtils enabling XSS attacks. (CVE-2025-32072)

- BlockList discloses rows containing suppressed users. (CVE-2025-6589)

- Failure to escape usernames in HTMLUserTextField validation errors enabling XSS attacks. (CVE-2025-6590)

- Failure to escape i18n messages in the action=feedcontributions API enabling XSS attacks. (CVE-2025-6591)

- Account creation links a temporary username/IP with the real username. (CVE-2025-6592)

- IP address leak to an unverified email. (CVE-2025-6593)

- Reflected XSS in apisandbox when an invalid 'format' value is provided. (CVE-2025-6594)

- Stored XSS through system messages in MultimediaViewer. (CVE-2025-6595)

- Vector inserts portlet labels as HTML, allowing stored XSS. (CVE-2025-6596)

- Autocreation is treated as a login for reauthentication. (CVE-2025-6597)

- Extensions are unable to suppress the reauth flag on login. (CVE-2025-6926)

- Autoblocks visibility and hidden username leaks. (CVE-2025-6927)

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Improper Authentication vulnerability in Wikimedia Foundation Mediawiki - CentralAuth Extension allows :
    Bypass Authentication.This issue affects Mediawiki - CentralAuth Extension: from 1.39.X before 1.39.13,     from 1.42.X before 1.42.7, from 1.43.X before 1.43.2. (CVE-2025-6926)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4249 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4249-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                       Guilhem Moulin     July 23, 2025                                 https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : mediawiki     Version        : 1:1.35.13-1+deb11u4     CVE ID         : CVE-2025-3469 CVE-2025-6590 CVE-2025-6591 CVE-2025-6593                      CVE-2025-6594 CVE-2025-6595 CVE-2025-6597 CVE-2025-6926                      CVE-2025-32072 CVE-2025-32696 CVE-2025-32698 CVE-2025-32699

    Multiple security vulnerabilities were found in mediawiki, a website     engine for collaborative work, that could lead to information     disclosure or privilege escalation.

    CVE-2025-3469

        User input was not properly sanitized during web page generation,         which could lead to information disclosure or privilege escalation         via Cross-site Scripting.

    CVE-2025-6590

        User input was not sanitized in the password reset form, which could lead         to information disclosure for private pages via transclusion.

    CVE-2025-6591

        HTML injection in API `action=feedcontributions` output from i18n         messages.

    CVE-2025-6593

        {{SITENAME}} registered email address has been changed email was         sent to unverified email addresses, which could lead to information         disclosure.

    CVE-2025-6594

        XSS in Special:ApiSandbox.  While the known issue is not exploitable         in 1.39, the backported changes provide some security hardening         just in case.

    CVE-2025-6595

        Stored XSS through system messages in MultimediaViewer.

    CVE-2025-6597

        Autocreation was treated as login for the purposes of security         reauthentication.  However it doesn't necessarily involve real-time         user identification, as it can be based on some provider identifying         the user based on a session cookie or similar low-fidelity         information.  An attacker who got hold of a CentralAuth session         cookie (valid on any wiki) could just visit a wiki where the user         has no local account yet, get an account autocreated, and then         change credentials or perform other sensitive operations.

    CVE-2025-6926

        Allow extensions to suppress the reauth flag on login.  This is a         workaround for extensions with some sort of autologin implemented         via the login page to indicate that the login flow didn't involve         the user actually logging in, it merely copied some central login         state, and so isn't appropriate for the reauthentication flag.

    CVE-2025-32072

        HTML injection in feed output from i18n message.

    CVE-2025-32696

         reupload-own restriction could be bypassed by reverting file.

    CVE-2025-32698

        Improper enforcing of suppression restrictions in LogPager.php.

    CVE-2025-32699

        Potential javascript injection attack enabled by Unicode         normalization in Action API.

    For Debian 11 bullseye, these problems have been fixed in version     1:1.35.13-1+deb11u4.

    We recommend that you upgrade your mediawiki packages.

    For the detailed security status of mediawiki please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/mediawiki

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5957 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-5957-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     July 03, 2025                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : mediawiki     CVE ID         : CVE-2025-6590 CVE-2025-6591 CVE-2025-6593 CVE-2025-6594                      CVE-2025-6595 CVE-2025-6597 CVE-2025-6926 CVE-2025-32072

    Multiple security issues were discovered in MediaWiki, a website engine     for collaborative work, which could result in cross-site scripting,     information disclosure, HTML injection or incorrect tracking of     authentication events.

    For the stable distribution (bookworm), these problems have been fixed in     version 1:1.39.13-1~deb12u1.

    We recommend that you upgrade your mediawiki packages.

    For the detailed security status of mediawiki please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/mediawiki

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
115340	MediaWiki 1.43.x < 1.43.2 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	7/28/2026	7/28/2026	medium
115339	MediaWiki 1.42.x < 1.42.7 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	7/28/2026	7/28/2026	medium
115338	MediaWiki < 1.39.13 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	7/28/2026	7/28/2026	medium
249010	Linux Distros Unpatched Vulnerability : CVE-2025-6926	Nessus	Misc.	8/12/2025	7/31/2026	high
242647	Debian dla-4249 : mediawiki - security update	Nessus	Debian Local Security Checks	7/23/2025	7/23/2025	medium
241337	Debian dsa-5957 : mediawiki - security update	Nessus	Debian Local Security Checks	7/3/2025	7/3/2025	medium

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