6.3

CVE-2026-40354: flatpak xdg-desktop-portal UNIX Symbolic Link (Symlink) Following

CVSS: 6.3v3.1MediumAnalyzed
AliasesSUSE-SU-2026:2712-1UBUNTU-CVE-2026-40354DEBIAN-CVE-2026-40354
Published 11-04-2026Last modified 15-04-2026
Open JSON

Vulnerability summary

CVE-2026-40354 is a medium (CVSS 6.3) UNIX Symbolic Link (Symlink) Following vulnerability in flatpak xdg-desktop-portal. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.5% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.16%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
USN-8287-1

Timeline

  1. 11-04-2026
    PublishedVulnerability first disclosed.
  2. 15-04-2026
    Last modifiedVulnerability information updated.

Description

Flatpak xdg-desktop-portal before 1.20.4 and 1.21.x before 1.21.1 allows any Flatpak app to trash any file in the host context via a symlink attack on g_file_trash.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

+0.03 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.16%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • xdg-desktop-portalAll versions (No fix recorded) | < 1.20.4+ds-1
Flatpak1 product
Suse1 product
  • xdg-desktop-portal&distro=SUSE Linux Enterprise Module for Desktop Applications 15 SP7< 1.18.2-150600.4.6.1
Ubuntu1 product
  • xdg-desktop-portalAll versions (No fix recorded) | < 1.18.4-1ubuntu2.24.04.2 | < 1.20.3+ds-1ubuntu1.1

4 vendors · 4 products

References

11 links
Show all 11 references