CVE-2026-13601
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
A flaw was found in Yelp due to an overly permissive Content Security Policy (CSP) in yelp-xsl. A malicious Flatpak application can open crafted help content via the OpenURI portal, embedding an untrusted CSS stylesheet within a structured SVG document. This allows bypassing Flatpak's sandbox isolation, enabling Yelp to evaluate local XML inclusions and disclose arbitrary user-readable host files through remote CSS resource requests.
Risk Assessment
The risk involves unauthorized disclosure of sensitive information from the user's system, such as configuration files or personal data, potentially leading to further attacks or privacy breaches.
Recommendation
Update yelp-xsl to the latest version that tightens the CSP policy, and consider restricting Flatpak application permissions to open help content.
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Original NVD description (English source)
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.