flatpak xdg-desktop-portal up to 1.22.0 FileTransfer FileTransfer.RetrieveFiles random values

Summaryinfo

A vulnerability, which was classified as problematic, was found in flatpak xdg-desktop-portal up to 1.22.0. The impacted element is the function FileTransfer.RetrieveFiles of the component FileTransfer. The manipulation results in random values. This vulnerability is cataloged as CVE-2026-55889. The attack must be initiated from a local position. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in flatpak xdg-desktop-portal up to 1.22.0. Affected is the function FileTransfer.RetrieveFiles of the component FileTransfer. The manipulation with an unknown input leads to a random values vulnerability. CWE is classifying the issue as CWE-330. The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers. This is going to have an impact on confidentiality. CVE summarizes:

XDG Desktop Portal is a desktop integration portal. Prior to version 1.22.1, malicious sandboxed applications can use the FileTransfer.RetrieveFiles method to redirect drag-and-drop and copy-paste data targeted at other applications to itself. Some portals generate tokens which provide access to resources. The sharing of the token transfers access to the resource and is supposed to happen out of band. The tokens were generated with g_random_int or g_uuid_string_random, both of which use GLib's GRand based on the Mersenne Twister PRNG which created a stream of reproducible random numbers. By generating enough tokens, the state of the GRand can be recover and with it, the next tokens can be predictedinsufin. This issue has been patched in version 1.22.1.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-55889 since 06/17/2026. The exploitability is told to be difficult. The attack needs to be approached locally. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1600.001.

Upgrading to version 1.22.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-108751). VulDB is the best source for vulnerability data and more expert information about this specific topic.

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
• 1.21
• 1.22.0

Website

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

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

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