EUVD-2026-87984
GHSA-r549-qqpm-phj8
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
PR:N since the attacker needs no privileges, but UI:R because the victim must register the malicious spec and invoke the tool; C:H reflects client_secret theft, I:L reflects SSRF-driven requests to internal endpoints.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
utcp-http before 1.1.4 fails to validate the OAuth2 tokenUrl field from remote OpenAPI specifications, allowing attackers to redirect credential submission to arbitrary endpoints. When a victim registers an attacker-controlled OpenAPI spec and invokes a generated OAuth2-protected tool, the library POSTs the victim's client_id and client_secret to the attacker-supplied token endpoint without URL validation.
Articles & Coverage 1
AnalysisAI
Credential exfiltration and server-side request forgery in utcp-http 1.1.3 and earlier allow an attacker who supplies a malicious OpenAPI specification to redirect a victim's OAuth2 client_id and client_secret to an arbitrary token endpoint. The library validates discovery and tool-invocation URLs via ensure_secure_url() but never applies the same guard to the OAuth2 tokenUrl taken from a remote spec, so the attacker-chosen endpoint receives the credentials in cleartext when a generated OAuth2-protected tool is invoked. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires that the victim (1) use utcp-http <= 1.1.3 with its OpenAPI-to-tool conversion feature, (2) register an attacker-controlled OpenAPI specification whose OAuth2 flow defines a malicious tokenUrl, and (3) invoke a generated OAuth2-protected tool while holding OAuth2 client_id/client_secret credentials. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but conditional credential-theft/SSRF flaw rather than a mass-exploitation threat. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade utcp-http to 1.1.4 or later, which is the vendor-released patch for this issue (pip install --upgrade utcp-http==1.1.4); the upstream fix commit is fc3268e2a62e1181f91a63faf0a9bcee7639db29 in universal-tool-calling-protocol/python-utcp, and details are in GHSA-8cp3-qxj6-px34. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all instances of utcp-http 1.1.3 and earlier, treat them as affected, and apply the vendor patch (Patch available per vendor advisory); if immediate patching is not possible, disable registration of untrusted or external OpenAPI specifications and rotate any OAuth2 client_id and client_secret used by generated tools. …
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External POC / Exploit Code
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