Flatpak xdg-desktop-portal up to 1.20.3/1.21.0 g_file_trash symlink

Summaryinfo

A vulnerability has been found in Flatpak xdg-desktop-portal up to 1.20.3/1.21.0 and classified as critical. Affected by this vulnerability is the function g_file_trash. Performing a manipulation results in symlink. This vulnerability is identified as CVE-2026-40354. The attack is only possible with local access. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Flatpak xdg-desktop-portal up to 1.20.3/1.21.0. This affects the function g_file_trash. The manipulation with an unknown input leads to a symlink vulnerability. CWE is classifying the issue as CWE-61. The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files. This is going to have an impact on integrity, and availability. The summary by CVE is:

Flatpak xdg-desktop-portal before 1.20.4 and 1.21.x before 1.21.1 allows any Flatpak app to trash any file in the host context via a symlink attack on g_file_trash.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-40354 since 04/11/2026. The exploitability is told to be difficult. An attack has to be approached locally. Technical details are known, but no exploit is available.

Upgrading to version 1.20.4 or 1.21.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Flatpak

Name

• xdg-desktop-portal

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.20.0
• 1.20.1
• 1.20.2
• 1.20.3
• 1.21.0

Website

• Product: https://github.com/flatpak/xdg-desktop-portal/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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