CVE-2026-55888High· 8.2▾ TwilightA flaw was found in xdg-desktop-portal. An attacker operating a sandboxed application can bypass isolation boundaries to gain unauthorized access to host files. This issue occurs because the FileChooser interface fails to properly validate…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 45.1 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 25.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
8.8 → 8.2
0.5%
A flaw was found in xdg-desktop-portal. An attacker operating a sandboxed application can bypass isolation boundaries to gain unauthorized access to host files. This issue occurs because the FileChooser interface fails to properly validate filenames before passing them to backend services. Consequently, a malicious application can create and manipulate arbitrary files on the host system, limited only by the permissions of the current user.
xdg-desktop-portal: xdg-desktop-portal: Unauthorized host file access via unvalidated FileChooser filenames — rated Important by Red Hat. Released 2026-10-23.
Affected:
No fix planned:
Affected
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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