Peppermint-Lab Peppermint up to 0.5.5 docker-compose.yml hard-coded credentials

Summaryinfo

A vulnerability was found in Peppermint-Lab Peppermint up to 0.5.5. It has been declared as very critical. This impacts an unknown function of the file docker-compose.yml. Executing a manipulation can lead to hard-coded credentials. This vulnerability is tracked as CVE-2026-85391. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Peppermint-Lab Peppermint up to 0.5.5. It has been declared as very critical. This vulnerability affects some unknown processing of the file docker-compose.yml. The manipulation with an unknown input leads to a hard-coded credentials vulnerability. The CWE definition for the vulnerability is CWE-798. The product contains hard-coded credentials, such as a password or cryptographic key, which it uses for its own inbound authentication, outbound communication to external components, or encryption of internal data. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-85391 since 09/03/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/03/2026). The MITRE ATT&CK project declares the attack technique as T1110.001.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-70668). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Peppermint-Lab

Name

• Peppermint

Version

• 0.5.0
• 0.5.1
• 0.5.2
• 0.5.3
• 0.5.4
• 0.5.5

Website

• Product: https://github.com/Peppermint-Lab/peppermint/

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Once again VulDB remains the best source for vulnerability data.

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