Is CVE-2026-40354 in the CISA KEV catalog?

No. CVE-2026-40354 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-40354?

CVE-2026-40354 has a CVSS v3 base score of 2.9 (LOW).

What is the EPSS score for CVE-2026-40354?

CVE-2026-40354 has an EPSS score of 0.13% (3th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40354?

Upgrade xdg-desktop-portal on debian unstable to 1.20.4+ds-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2026-40354

LOW

2.9

CVSS v3

NVD

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.

CWE-61

How to fix

Remediation Available

xdg-desktop-portalDebian

Fixed in:1.20.4+ds-1CVE-2026-40354

xdg-desktop-portalUbuntu

Fixed in:1.18.4-1ubuntu2.24.04.2USN-8287-1

Fixed in:1.20.3+ds-1ubuntu1.1USN-8287-1

xdg-desktop-portal-devUbuntu

Fixed in:1.18.4-1ubuntu2.24.04.2USN-8287-1

Fixed in:1.20.3+ds-1ubuntu1.1USN-8287-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.13%probability of exploitation in 30 days

3rdpercentile

Low risk: more likely to be exploited than 3% of all known CVEs.

References

Vendor Advisory1

github.com

Mailing List1

openwall.com

Product2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-27.