CVE-2026-18353: 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 di
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.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-18353
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-183530.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-18353 | coverage & exploitation status | NVD · CVE.org |
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