CVE-2026-55888

UNKNOWN 0.0

XDG Desktop Portal: Arbitrary file access via SaveFiles "files" option path traversal

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	flatpak
Product	xdg-desktop-portal
Published	Oct 23, 2026

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Affected Versions

flatpak / xdg-desktop-portal

< 1.22.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/flatpak/xdg-desktop-portal/security/advisories/GHSA-cm83-2936-gxjm github.com: https://github.com/flatpak/xdg-desktop-portal/releases/tag/1.22.1