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CVE-2026-55888

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

HIGH
8.8
CVSS Score
Published: October 23, 2026 at 12:35 PM UTC
Updated: October 30, 2026 at 03:16 PM UTC
1 product affected across 1 vendorXdg Desktop Portal

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Severity
HIGH8.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

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

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHGitHub_M
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-22

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