CVE-2026-73079 (GCVE-0-2026-73079)
Vulnerability from cvelistv5 – Published: 2026-08-11 15:54 – Updated: 2026-08-11 16:42
VLAI
EPSS
VEX
Title
Sub2API: Path traversal in the Responses subpath routes lets an authenticated tenant relay requests to arbitrary upstream endpoints using pooled account credentials
Summary
Sub2API is an AI API gateway platform designed to distribute and manage API quotas from AI product subscriptions. From 0.1.135, to 0.1.168, platform API keys issued to tenants are exchanged for upstream requests made with shared provider accounts (ChatGPT/Codex OAuth, OpenAI platform keys, or an operator-configured base URL) that belong to the operator, not to the caller. The `POST /responses/*subpath` wildcard routes spliced the client-supplied subpath into the upstream URL with no validation. This lets an authenticated tenant relay requests to arbitrary upstream endpoints using pooled account credentials via a path traversal. This vulnerability is fixed in 0.1.169.
Severity
8.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-11 16:42 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/Wei-Shaw/sub2api/security/advi… | x_refsource_CONFIRM |
| https://github.com/Wei-Shaw/sub2api/pull/5137 | x_refsource_MISC |
| https://github.com/Wei-Shaw/sub2api/commit/017f6b… | x_refsource_MISC |
| https://github.com/Wei-Shaw/sub2api/releases/tag/… | x_refsource_MISC |
Impacted products
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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