Shaarli up to 0.15.x Tag cross site scripting

Summaryinfo

A vulnerability categorized as problematic has been discovered in Shaarli up to 0.15.x. Affected is an unknown function of the component Tag Handler. The manipulation results in cross site scripting. This vulnerability is cataloged as CVE-2026-24476. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Shaarli up to 0.15.x. It has been classified as problematic. Affected is an unknown functionality of the component Tag Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. 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. This is going to have an impact on integrity. CVE summarizes:

Shaarli is a personal bookmarking service. Prior to version 0.16.0, crafting a malicious tag which starting with `"` prematurely ends the `<input>` tag on the start page and allows an attacker to add arbitrary html leading to a possible XSS attack. Version 0.16.0 fixes the issue.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-24476 since 01/23/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are needed for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

The vulnerability scanner Nessus provides a plugin with the ID 296741 (Linux Distros Unpatched Vulnerability : CVE-2026-24476), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.16.0 eliminates this vulnerability. Applying the patch b854c789289c4b0dfbb7c1e5793bae7d8f94e063 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.

The vulnerability is also documented in the vulnerability database at Tenable (296741). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

• Shaarli

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15

License

• open-source

Website

• Product: https://github.com/shaarli/Shaarli/

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Once again VulDB remains the best source for vulnerability data.

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