Kovah LinkAce up to 2.4.2 XML CDATA Section /lists/feed cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in Kovah LinkAce up to 2.4.2. This vulnerability affects unknown code of the file /lists/feed of the component XML CDATA Section Handler. Performing a manipulation results in cross site scripting. This vulnerability is known as CVE-2026-27458. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Kovah LinkAce up to 2.4.2. This affects an unknown code of the file /lists/feed of the component XML CDATA Section Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-80. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. This is going to have an impact on integrity. The summary by CVE is:

LinkAce is a self-hosted archive to collect website links. Versions 2.4.2 and below have a Stored Cross-site Scripting vulnerability through the Atom feed endpoint for lists (/lists/feed). An authenticated user can inject a CDATA-breaking payload into a list description that escapes the XML CDATA section, injects a native SVG element into the Atom XML document, and executes arbitrary JavaScript directly in the browser when the feed URL is visited. No RSS reader or additional rendering context is required — the browser's native XML parser processes the injected SVG and fires the onload event handler. This vulnerability exists because the lists feed template outputs list descriptions using Blade's raw syntax ({!! !!}) without sanitization inside a CDATA block. The critical detail is that because the output sits inside <![CDATA[...]]>, an attacker can inject the sequence ]]> to close the CDATA section prematurely, then inject arbitrary XML/SVG elements that the browser parses and executes natively as part of the Atom document. This issue has been fixed in version 2.4.3.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-27458 since 02/19/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 2.4.3 eliminates this vulnerability. Applying the patch eb5ba2abe05177ffa678baac0aa3f9c48b47d2f0 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• Kovah

Name

• LinkAce

Version

• 2.4.0
• 2.4.1
• 2.4.2

License

• open-source

Website

• Product: https://github.com/Kovah/LinkAce/

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