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CVE-2026-40354

Quick assessment

Affected
Flatpak xdg-desktop-portal
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

XDG Desktop Portal是Flatpak开源的一个桌面应用沙盒环境的前端服务。 XDG Desktop Portal 1.20.4之前版本和1.21.1之前版本存在安全漏洞，该漏洞源于任何Flatpak应用程序可能通过符号链接攻击对g_file_trash进行操作，导致在主机环境中删除任意文件。

CVSS 2.9 · Low EPSS 0.16% · P4
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I. Basic Information for CVE-2026-40354

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
XDG Desktop Portal 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
XDG Desktop Portal是Flatpak开源的一个桌面应用沙盒环境的前端服务。 XDG Desktop Portal 1.20.4之前版本和1.21.1之前版本存在安全漏洞，该漏洞源于任何Flatpak应用程序可能通过符号链接攻击对g_file_trash进行操作，导致在主机环境中删除任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Flatpak xdg-desktop-portal 0 ~ 1.20.4 -

II. Public POCs for CVE-2026-40354

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III. Intelligence Information for CVE-2026-40354

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Vendor Advisories for CVE-2026-40354 (1)

Mailing List Discussions for CVE-2026-40354 (1)

Vendor Pages for CVE-2026-40354 (2)

IV. Related Vulnerabilities

Same vendor: Flatpak
Same weakness: CWE-61

V. Comments for CVE-2026-40354

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