CVE-2026-42261
- Source
- https://cve.org/CVERecord?id=CVE-2026-42261
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42261.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-42261
- Aliases
-
- GHSA-9fhh-fjfg-5mr6
- Published
- 2026-05-08T03:11:25.305Z
- Modified
- 2026-07-15T01:48:57.269662738Z
- Severity
-
- 7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N CVSS Calculator
- Summary
- PromptHub: Authenticated SSRF via IPv6 filter bypass in `POST /api/skills/fetch-remote`
- Details
-
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.
- Database specific
{ "cna_assigner": "GitHub_M", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42261.json", "cwe_ids": [ "CWE-20", "CWE-693", "CWE-918" ] }- References