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NVD / CVE Program· CNA mitre

CVE-2026-40354: 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…

MediumCVSS 6.3 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 25/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.13% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Flatpak xdg-desktop-portal 1.20.4, 1.21.1.
  • Severity is disputed: the assigning authority (CNA) scores it 2.9, NVD 6.3.

Low priority for now. Upgrade to Flatpak xdg-desktop-portal 1.20.4, 1.21.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Apr 11, 2026
Updated
Oct 26, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

25

Monitor

Low priority for now.

CVSS
25 / 40 · 6.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
6.3
CNA · mitre
2.9
3.4 point gap

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-40354

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
flatpakxdg-desktop-portal

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mitre). Independent of NVD's CPE analysis and usually ahead of it.

  • Flatpak xdg-desktop-portal

    • before 1.20.4affected · semver
    • 1.21.0 and later · before 1.21.1affected · semver

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • flatpak xdg-desktop-portalbefore 1.20.4
  • flatpak xdg-desktop-portal1.21.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12xdg-desktop-portalfrom 0—
Debian:14xdg-desktop-portalbefore 1.20.4+ds-11.20.4+ds-1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSxdg-desktop-portalbefore 1.16.0-150500.3.13.11.16.0-150500.3.13.1
SUSE:Linux Enterprise Module for Desktop Applications 15 SP7xdg-desktop-portalbefore 1.18.2-150600.4.6.11.18.2-150600.4.6.1

Same product

flatpak: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-55888XDG Desktop Portal: Arbitrary file access via SaveFiles "files" option path traversal
    35Monitor
  • CVE-2026-55889XDG Desktop Portal: Drag-and-drop and copy-paste theft via predictable FileTransfer key
    33Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Flatpak xdg-desktop-portal1.20.4Vendor (CNA)
Flatpak xdg-desktop-portal1.21.1Vendor (CNA)
debian:xdg-desktop-portal1.20.4+ds-1 · Debian:14Package registry (OSV)
suse:xdg-desktop-portal1.18.2-150600.4.6.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-61 · UNIX Symbolic Link (Symlink) Following

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records