EUVD-2026-51066Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/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
Unauthenticated network endpoint with an unverified iss check (PR:N/AC:L); SSRF yields high integrity control over outbound requests (I:H) and limited data exposure (C:L), no availability impact.
Primary rating from Vendor (eclipse).
CVSS VectorVendor: eclipse
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/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
Lifecycle Timeline
3DescriptionCVE.org
PIA's POST /v1/upload/sbom endpoint accepts a Bearer JWT and checks its unverified iss claim against an issuer allowlist using Python's urlparse before performing OIDC discovery with requests. Because urlparse and requests/urllib3 parse an authority string containing a backslash (e.g. https://attacker-host\@ci.eclipse.org/) into *different* hostnames, an attacker can craft an issuer that passes the allowlist check yet drives requests - and subsequently urllib.request.urlopen for JWKS retrieval - to connect to an arbitrary attacker-chosen host, port, and scheme.
Articles & Coverage 1
AnalysisAI
Server-side request forgery in the Eclipse CSI PIA POST /v1/upload/sbom endpoint lets remote attackers coerce the server into connecting to an arbitrary host, port, and scheme of their choosing. By exploiting a parser-differential between Python's urlparse (used for the issuer allowlist check) and requests/urllib3/urllib (used for OIDC discovery and JWKS retrieval), an attacker crafts a JWT iss claim containing a backslash that passes validation but resolves to a different host during the actual fetch. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires reaching the `POST /v1/upload/sbom` endpoint over the network and submitting a Bearer JWT whose `iss` claim is a crafted issuer URL containing a backslash-plus-`@` authority (e.g. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H, base 8.8) indicates a network-reachable, low-complexity, unauthenticated SSRF with high integrity impact - consistent with an attacker steering server-side requests to internal or attacker-controlled endpoints. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker submits a request to `POST /v1/upload/sbom` with a Bearer JWT whose `iss` claim is `https://attacker-host\@ci.eclipse.org/`; the allowlist check reads the authority as the trusted `ci.eclipse.org` and passes, but OIDC discovery and JWKS retrieval connect to `attacker-host` instead. The attacker uses this to reach internal-only services, scan internal ports, or serve attacker-controlled key material into the token-validation flow. … |
| Remediation | Apply the fix from the Eclipse CSI PIA GitHub Security Advisory GHSA-v249-9xjm-qhgf (https://github.com/eclipse-csi/pia/security/advisories/GHSA-v249-9xjm-qhgf); an exact patched version is not stated in the provided data, so confirm and pin the fixed release from that advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Eclipse CSI PIA deployments and restrict network access to the /v1/upload/sbom endpoint using firewall rules or WAF-permit only known SBOM sources. …
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External POC / Exploit Code
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