CVE-2026-55888: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in flatpak xdg-desktop-portal
Description
XDG Desktop Portal is a desktop integration portal. Prior to version 1.22.1, malicious sandboxed applications can use the FileChooser.SaveFiles method to gain arbitrary file access to non-existing files on the host (limited to files the user has access to). The FileChooser.SaveFiles method takes optional filenames which get appended to the selected directory by backends. The backends are supposed to check that the file does not exist yet. The filenames are not validated by the frontend and also not by common backends. This issue has been patched in version 1.22.1.
CVSS v4.0
Score 8.8high
Affected software
flatpak
xdg-desktop-portal
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-17T16:59:42.760Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6adb5ab74d27ba8daa28669a
Added to database: 10/23/2026, 13:01:43 UTC
Last updated: 10/23/2026, 13:01:43 UTC
Views: 1
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