Vulnerability · Published Mar 11, 2026 · Assigned by GitHub_M

CVE-2026-31975Cloud CLI WebSocket shell injection

High 8.7

In plain English

A high-severity OS command injection in claudecodeui from siteboon. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 3.9% (higher than 90% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)3.9%top 9.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Cloud CLI (aka Claude Code UI) is a desktop and mobile UI for Claude Code, Cursor CLI, Codex, and Gemini-CLI. Prior to 1.25.0, OS Command Injection via WebSocket Shell. Both projectPath and initialCommand in server/index.js are taken directly from the WebSocket message payload and interpolated into a bash command string without any sanitization, enabling arbitrary OS command execution. A secondary injection vector exists via unsanitized sessionId. This vulnerability is fixed in 1.25.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@siteboon/claude-code-ui	1.25.0	GHSA-gv8f-wpm2-m5wr

Affected products (as reported)

Vendor	Product	Versions
siteboon	claudecodeui	< 1.25.0

Weakness: CWE-78 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

https://github.com/siteboon/claudecodeui/security/advisories/GHSA-gv8f-wpm2-m5wr x_refsource_CONFIRM
https://github.com/siteboon/claudecodeui/commit/12e7f074d9563b3264caf9cec6e1b701c301af26 x_refsource_MISC
https://github.com/siteboon/claudecodeui/releases/tag/v1.25.0 x_refsource_MISC