Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-55889— XDG Desktop Portal: Drag-and-drop and copy-paste theft via predictable FileTransfer key

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 是一个用于桌面集成的门户服务。在 1.22.1 版本之前，恶意的沙箱应用程序可以利用 FileTransfer.RetrieveFiles 方法，将原本应指向其他应用程序的拖放（drag-and-drop）和复制粘贴数据重定向到自身。部分门户服务会生成用于访问资源的令牌（token），令牌的共享即意味着资源访问权限的转移，且该过程本应通过带外（out-of-band）渠道进行。然而，这些令牌是使用 g_random_int 或 g_uuid_string_random 生成的，

CVSS 8.3 · High

Possible ATT&CK Techniques 2 AI

T1076 T1055 · Process Injection

Affected Version Matrix 1

VendorProduct Version RangeStatus
flatpak xdg-desktop-portal < 1.22.1 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-55889

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
XDG Desktop Portal: Drag-and-drop and copy-paste theft via predictable FileTransfer key
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 FileTransfer.RetrieveFiles method to redirect drag-and-drop and copy-paste data targeted at other applications to itself. Some portals generate tokens which provide access to resources. The sharing of the token transfers access to the resource and is supposed to happen out of band. The tokens were generated with g_random_int or g_uuid_string_random, both of which use GLib's GRand based on the Mersenne Twister PRNG which created a stream of reproducible random numbers. By generating enough tokens, the state of the GRand can be recover and with it, the next tokens can be predictedinsufin. This issue has been patched in version 1.22.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不充分的随机数
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-2026-55889

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-55889

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-55889 (1)

Vendor Pages for CVE-2026-55889 (1)

IV. Related Vulnerabilities

Same product: xdg-desktop-portal
Same vendor: flatpak
Same weakness: CWE-330

V. Comments for CVE-2026-55889

No comments yet

Leave a comment