{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-42261", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-26T11:53:27.705Z", "datePublished": "2026-05-08T03:11:25.305Z", "dateUpdated": "2026-05-11T18:11:16.696Z"}, "containers": {"cna": {"title": "PromptHub: Authenticated SSRF via IPv6 filter bypass in `POST /api/skills/fetch-remote`", "problemTypes": [{"descriptions": [{"cweId": "CWE-20", "lang": "en", "description": "CWE-20: Improper Input Validation", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-693", "lang": "en", "description": "CWE-693: Protection Mechanism Failure", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-918", "lang": "en", "description": "CWE-918: Server-Side Request Forgery (SSRF)", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/legeling/PromptHub/security/advisories/GHSA-9fhh-fjfg-5mr6", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/legeling/PromptHub/security/advisories/GHSA-9fhh-fjfg-5mr6"}, {"name": "https://github.com/legeling/PromptHub/releases/tag/v0.5.4", "tags": ["x_refsource_MISC"], "url": "https://github.com/legeling/PromptHub/releases/tag/v0.5.4"}], "affected": [{"vendor": "legeling", "product": "PromptHub", "versions": [{"version": ">= 0.4.9, < 0.5.4", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-08T03:11:25.305Z"}, "descriptions": [{"lang": "en", "value": "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 \u2014 a supported and documented configuration \u2014 this means any internet user who can register. This issue has been patched in version 0.5.4."}], "source": {"advisory": "GHSA-9fhh-fjfg-5mr6", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/legeling/PromptHub/security/advisories/GHSA-9fhh-fjfg-5mr6", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-11T18:10:25.854871Z", "id": "CVE-2026-42261", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-11T18:11:16.696Z"}}]}}

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{}

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