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Vulnerability details

CVE-2026-55889

Flatpak xdg-desktop-portal

XDG Desktop Portal: Drag-and-drop and copy-paste theft via predictable FileTransfer key

CVSS 4.0
8.3High

Official description

XDG Desktop Portal is a desktop integration portal. Prior to version 1.22.1, malicious sandboxed applications can use the FileTransfer.RetrieveFiles method to redirect drag-and-drop and copy-paste data targeted at other applications to itself. Some portals generate tokens which provide access to resources. The sharing of the token transfers access to the resource and is supposed to happen out of band. The tokens were generated with g_random_int or g_uuid_string_random, both of which use GLib's GRand based on the Mersenne Twister PRNG which created a stream of reproducible random numbers. By generating enough tokens, the state of the GRand can be recover and with it, the next tokens can be predictedinsufin. This issue has been patched in version 1.22.1.

CVSS scores

ScoreVersionSourceVector
8.3High 4.0 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Affected products

VendorProductVersionsSource
Flatpak xdg-desktop-portal < 1.22.1 CVEProject cvelistV5 (CNA)

References and advisories

2
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Details

Published
2026-10-23
Last updated
2026-10-23
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.34%
Probability of exploitation in 30 days
28.1%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Partial

Weaknesses (CWE)

  • CWE-330
    Use of Insufficiently Random Values
  • CWE-337
    Predictable Seed in Pseudo-Random Number Generator (PRNG)