Vulnerability · Published Sep 3, 2026 · Assigned by VulnCheck
CVE-2026-85391Peppermint through 0.5.5 Use of Hard-coded JWT Signing Secret in docker-compose.yml
Critical 9.8
In plain English
A critical-severity hard-coded credentials in peppermint from Peppermint-Lab. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.6%top 49.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Peppermint through 0.5.5 contains a hardcoded JWT signing secret in docker-compose.yml that allows unauthenticated attackers to forge session tokens for any account. Attackers can use the published secret to mint valid tokens for arbitrary user IDs and access protected endpoints without credentials.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Peppermint-Lab | peppermint | 0 – through 0.5.5 |
Weakness: CWE-798 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- GitHub Issue #528 issue-tracking
- https://github.com/Peppermint-Lab/peppermint product
- https://github.com/Peppermint-Lab/peppermint/blob/0.5.5/docker-compose.yml technical-description
- https://github.com/Peppermint-Lab/peppermint/blob/0.5.5/apps/api/src/lib/jwt.ts technical-description
- VulnCheck Advisory: Peppermint through 0.5.5 Use of Hard-coded JWT Signing Secret in docker-compose.yml third-party-advisory