Backdrop CMS up to 1.28.4/1.29.2 SVG Image cross site scripting

Summaryinfo

A vulnerability was found in Backdrop CMS up to 1.28.4/1.29.2. It has been declared as problematic. This affects an unknown part of the component SVG Image Handler. The manipulation results in cross site scripting. This vulnerability is cataloged as CVE-2025-25063. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Backdrop CMS up to 1.28.4/1.29.2. Affected is some unknown processing of the component SVG Image 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:

An XSS issue was discovered in Backdrop CMS 1.28.x before 1.28.5 and 1.29.x before 1.29.3. It does not sufficiently validate uploaded SVG images to ensure they do not contain potentially dangerous SVG tags. SVG images can contain clickable links and executable scripting, and using a crafted SVG, it is possible to execute scripting in the browser when an SVG image is viewed. This issue is mitigated by the attacker needing to be able to upload SVG images, and that Backdrop embeds all uploaded SVG images within <img> tags, which prevents scripting from executing. The SVG must be viewed directly by its URL in order to run any embedded scripting.

The advisory is shared for download at backdropcms.org. This vulnerability is traded as CVE-2025-25063 since 02/03/2025. The exploitability is told to be difficult. It is possible to launch the attack remotely. 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.

Upgrading to version 1.28.5 or 1.29.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-4005). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Content Management System

Vendor

• Backdrop

Name

• CMS

Version

• 1.28.0
• 1.28.1
• 1.28.2
• 1.28.3
• 1.28.4
• 1.29.0
• 1.29.1
• 1.29.2

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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