---
id: CVE-2026-55889
title: >-
  xdg-desktop-portal: xdg-desktop-portal: unauthorized data disclosure via
  predictable token generation (CVE-2026-55889)
summary: >-
  A flaw was found in xdg-desktop-portal. The service uses a predictable
  pseudorandom number generator (PRNG) to generate authorization tokens that
  manage access to shared system resources. By requesting enough tokens to
  determine the intern…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N'
cvssSource: vendor
cwe:
  - CWE-338
  - CWE-330
  - CWE-337
vendor: Red Hat
product: Red Hat Enterprise Linux 7
affected:
  - enterprise_linux 10
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T17:24:32+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55889.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55889.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-55889'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2559821'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-55889'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55889'
  - url: 'https://github.com/flatpak/xdg-desktop-portal/releases/tag/1.22.1'
  - url: >-
      https://github.com/flatpak/xdg-desktop-portal/security/advisories/GHSA-c5cf-79w8-pvfh
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-23T14:48:48.243981Z'
scores:
  vendor: 5.3
  cna: 8.3
ingestedAt: '2026-10-23T13:24:55.510Z'
---

## Overview

A flaw was found in xdg-desktop-portal. The service uses a predictable pseudorandom number generator (PRNG) to generate authorization tokens that manage access to shared system resources. By requesting enough tokens to determine the internal state of the generator, a malicious sandboxed application can predict future tokens. This flaw allows an attacker to intercept or redirect clipboard and drag-and-drop data intended for other applications, resulting in unauthorized data disclosure.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55889.json)

**xdg-desktop-portal: xdg-desktop-portal: unauthorized data disclosure via predictable token generation** — rated Moderate by Red Hat. Released 2026-10-23.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9

## Remediation

Fix deferred