{"id":"CVE-2026-18353","summary":"Unauthenticated SSRF in PIA via OIDC issuer allowlist bypass","details":"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.","aliases":["GHSA-v249-9xjm-qhgf"],"modified":"2026-08-12T03:51:28.702049854Z","published":"2026-07-30T07:23:04.083Z","database_specific":{"cwe_ids":["CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18353.json","cna_assigner":"eclipse"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18353.json"},{"type":"ADVISORY","url":"https://github.com/eclipse-csi/pia/security/advisories/GHSA-v249-9xjm-qhgf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18353"},{"type":"PACKAGE","url":"https://github.com/eclipse-csi/pia"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/eclipse-csi/pia","events":[{"introduced":"5c70fac6f60dbbead382480528122c561536f1ef"},{"fixed":"b2180f4bc21ca5120dfa3cecec06e113ca847ff8"}],"database_specific":{"extracted_events":[{"introduced":"0.4.0"},{"fixed":"0.6.0"}],"source":"AFFECTED_FIELD"}}],"versions":["v0.5.0","v0.4.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-18353.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}