CVE-2026-42261
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk15th percentile - higher than 15% of all known CVEs
Summary
A vulnerability in PromptHub allows SSRF (Server-Side Request Forgery) attacks due to improper IPv6 address validation, enabling authenticated users to access private IP addresses. The issue affects versions from 0.4.9 to before 0.5.4.
Risk Assessment
An attacker could exploit this vulnerability to gain access to internal network resources, potentially leading to the exposure of sensitive data or further attacks on the organization's infrastructure.
Recommendation
It is recommended to update PromptHub to version 0.5.4 or later to mitigate this vulnerability. Additionally, consider restricting access to the endpoint for unauthorized users.
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Original NVD description (English source)
PromptHub is an all-in-one AI toolbox for prompt, skill, and agent management. From version 0.4.9 to before version 0.5.4, apps/web/src/routes/skills.ts exposes an authenticated endpoint POST /api/skills/fetch-remote that fetches a user-supplied URL server-side and reflects the response body (up to 5 MB) back to the caller. The SSRF protection in apps/web/src/utils/remote-http.ts (isPrivateIPv6) attempts to block private/loopback destinations, but multiple alternate-but-valid IPv6 representations bypass the check. The bypasses reach any IPv4 address (loopback, RFC1918, link-local) via IPv4-mapped IPv6 in hex form, and the canonical ::1 via any representation that isn't the literal string "::1". Any authenticated user (role: user or admin) can trigger the SSRF. On deployments configured with ALLOW_REGISTRATION=true — a supported and documented configuration — this means any internet user who can register. This issue has been patched in version 0.5.4.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS