What is CVE-2026-85178?

CVE-2026-85178 is a high-severity vulnerability in Helicone, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.7/10. Published 2026-09-03.

How severe is CVE-2026-85178?

High severity. CVSS v3 base score is 7.7 out of 10.

Auth bypass in Helicone

CVE-2026-85178

Helicone's VaultManager.getDecryptedProviderKeyById() function in the GET /v1/vault/key/{providerKeyId} endpoint fails to validate the requester's organization against the vault key's organization identifier. Attackers with admin or owner privileges in any organization can retrieve decrypted upstream provider credentials for other tenants, including plaintext OpenAI, Anthropic, and Bedrock API keys.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-09-03 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (34.3th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002

Affected products

Helicone

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

github.com/Helicone/helicone (product)
github.com/Helicone/helicone/commit/ca34549ea56f7ed587843f82d9cc19baa1f36ba4 (patch)
github.com/Helicone/helicone/issues/5712 (issue-tracking)
www.vulncheck.com/advisories/helicone-cross-tenant-provider-key-disclosure-via-… (third-party-advisory)

Frequently asked questions

What is CVE-2026-85178?: CVE-2026-85178 is a high-severity vulnerability in Helicone, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 7.7/10. Published 2026-09-03.
How severe is CVE-2026-85178?: High severity. CVSS v3 base score is 7.7 out of 10.