CVE-2026-40354 Vulnerability Analysis & Exploit Details

CVE-2026-40354
Vulnerability Scoring

2.9
/10
Low Risk

Security experts classify CVE-2026-40354 as a minor vulnerability with limited consequences.

Attack Complexity Details

  • Attack Complexity: High
    Exploits require significant effort and special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-40354 Details

Status: Analyzed

Last updated: 🕚 27 Apr 2026, 23:11 UTC
Originally published on: 🕐 11 Apr 2026, 01:16 UTC

Time between publication and last update: 16 days

CVSS Release: version 3

CVSS3 Source

cve@mitre.org

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2026-40354 Vulnerability Summary

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 attack on g_file_trash.

Assessing the Risk of CVE-2026-40354

Access Complexity Graph

The exploitability of CVE-2026-40354 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-40354

CVE-2026-40354 presents a challenge to exploit due to its high attack complexity, but the absence of privilege requirements still makes it a viable target for skilled attackers. A thorough security review is advised.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-40354, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-40354, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2026-40354 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2026-40354 poses no threat to data integrity.
  • Availability: Low
    CVE-2026-40354 may slightly degrade system performance without fully affecting service availability.

CVE-2026-40354 References

External References

CWE Common Weakness Enumeration

CWE-61

CAPEC Common Attack Pattern Enumeration and Classification

  • Leveraging Race Conditions via Symbolic Links CAPEC-27 This attack leverages the use of symbolic links (Symlinks) in order to write to sensitive files. An attacker can create a Symlink link to a target file not otherwise accessible to them. When the privileged program tries to create a temporary file with the same name as the Symlink link, it will actually write to the target file pointed to by the attackers' Symlink link. If the attacker can insert malicious content in the temporary file they will be writing to the sensitive file by using the Symlink. The race occurs because the system checks if the temporary file exists, then creates the file. The attacker would typically create the Symlink during the interval between the check and the creation of the temporary file.

Vulnerable Configurations

  • cpe:2.3:a:flatpak:xdg-desktop-portal:0.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:0.2:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:0.3:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:0.4:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:0.4:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:0.5:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:0.5:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:0.6:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:0.6:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:0.7:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:0.7:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:0.8:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:0.8:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:0.9:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:0.9:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:0.10:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:0.10:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:0.11:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:0.11:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:0.99:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:0.99:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.4.2:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.5.2:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.5.2:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.5.3:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.5.3:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.5.4:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.5.4:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.7.2:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.10.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.10.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.2:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.2:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.3:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.3:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.4:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.4:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.5:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.5:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.6:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.12.6:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.2:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.2:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.3:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.3:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.4:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.4:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.5:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.5:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.6:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.14.6:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.15.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.15.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.16.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.16.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.16.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.16.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.17.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.17.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.17.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.17.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.17.2:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.17.2:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.18.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.18.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.18.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.18.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.18.2:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.18.2:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.18.3:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.18.3:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.18.4:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.18.4:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.19.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.19.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.19.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.19.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.19.2:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.19.2:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.19.3:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.19.3:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.19.4:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.19.4:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.20.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.20.0:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.20.1:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.20.1:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.20.2:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.20.2:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.20.3:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.20.3:*:*:*:*:*:*:*
  • cpe:2.3:a:flatpak:xdg-desktop-portal:1.21.0:*:*:*:*:*:*:*
    cpe:2.3:a:flatpak:xdg-desktop-portal:1.21.0:*:*:*:*:*:*:*

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