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CVE-2026-55888— XDG Desktop Portal: Arbitrary file access via SaveFiles "files" option path traversal

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 是一个桌面集成门户服务。在 1.22.1 版本之前，恶意的沙盒化应用程序可利用 FileChooser.SaveFiles 方法，获取对主机上不存在文件的任意文件访问权限（仅限于用户有权限访问的文件）。FileChooser.SaveFiles 方法接受可选的文件名参数，这些文件名会被后端追加到所选目录中。后端本应检查该文件是否尚不存在，但前端并未对这些文件名进行验证，且常见的后端实现也未进行验证。该问题已在 1.22.1 版本中修复。

CVSS 8.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
flatpak xdg-desktop-portal < 1.22.1 affected
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I. Basic Information for CVE-2026-55888

Vulnerability Information
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Vulnerability Title
XDG Desktop Portal: Arbitrary file access via SaveFiles "files" option path traversal
Source: CVE Program / CVE List V5
Vulnerability Description
XDG Desktop Portal is a desktop integration portal. Prior to version 1.22.1, malicious sandboxed applications can use the FileChooser.SaveFiles method to gain arbitrary file access to non-existing files on the host (limited to files the user has access to). The FileChooser.SaveFiles method takes optional filenames which get appended to the selected directory by backends. The backends are supposed to check that the file does not exist yet. The filenames are not validated by the frontend and also not by common backends. This issue has been patched in version 1.22.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
flatpak xdg-desktop-portal < 1.22.1 -

II. Public POCs for CVE-2026-55888

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III. Intelligence Information for CVE-2026-55888

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Vendor Advisories for CVE-2026-55888 (1)

Vendor Pages for CVE-2026-55888 (1)

IV. Related Vulnerabilities

Same product: xdg-desktop-portal
Same vendor: flatpak
Same weakness: CWE-22

V. Comments for CVE-2026-55888

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