---
title: "CVE-2026-55888: XDG Desktop Portal - Arbitrary File Access"
description: "XDG Desktop Portal < 1.22.1 contains an arbitrary file access vulnerability caused by improper validation of filenames in FileChooser.SaveFiles method, letting malicious sandboxed applications access non-existing files the user can access, exploit requires sandboxed application."
url: https://panop.io/threat-heartbeat/CVE-2026-55888/
---

# CVE-2026-55888 XDG Desktop Portal - Arbitrary File Access

XDG Desktop Portal < 1.22.1 contains an arbitrary file access vulnerability caused by improper validation of filenames in FileChooser.SaveFiles method, letting malicious sandboxed applications access non-existing files the user can access, exploit requires sandboxed application.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.52% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-55888)

## Details

Type

Arbitrary File Access

Impact

File System Read, File System Write

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

23 October 2026

Updated

25 October 2026

Weakness

[CWE-22](https://cwe.mitre.org/data/definitions/22.html)

## Vendor fix

Update to version 1.22.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-55888](https://nvd.nist.gov/vuln/detail/CVE-2026-55888)
- [https://github.com/flatpak/xdg-desktop-portal/releases/tag/1.22.1](https://github.com/flatpak/xdg-desktop-portal/releases/tag/1.22.1)
- [https://github.com/flatpak/xdg-desktop-portal/security/advisories/GHSA-cm83-2936-gxjm](https://github.com/flatpak/xdg-desktop-portal/security/advisories/GHSA-cm83-2936-gxjm)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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