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Vulnerabilities CVE-2026-13601

CVE-2026-13601

High
Open
TLP:CLEAR

Yelp: yelp-xsl: overly permissive content security policy in yelp allows host file disclosure from flatpak applications

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Description

A flaw was found in Yelp due to an overly permissive Content Security Policy (CSP) implementation provided by yelp-xsl. A malicious Flatpak application can open crafted help content through the OpenURI portal. By embedding an untrusted CSS stylesheet within a structured SVG document, attacker-controlled content can bypass Flatpak's intended sandbox isolation, allowing Yelp to evaluate local XML inclusions and disclose arbitrary user-readable host files through remote CSS resource requests. This may result in the unauthorized disclosure of sensitive information.

Details

CVSS Score
7.1
EPSS Score
0.12%

2.2th percentile

CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Confidence
90%
Published
Jun 29, 2026
Last Modified
Aug 13, 2026
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