What’s Vulnerable › Vulnerabilities

CVE-2026-55164: Lemur: Plaintext password storage in Lemur user-update path

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-18 · updated 2026-09-08
• Weakness: CWE-256

Description

Lemur manages TLS certificate creation. Prior to 1.9.2, lemur.users.service.update assigned a replacement password directly to users.password, while lemur/users/models.py registered User.hash_password only for the before_insert event. Because no before_update listener ran, administrator-initiated password changes through PUT /api/1/users/ were committed as plaintext. The affected user could no longer authenticate normally because bcrypt verification received an unhashed value. A database, backup, replica, query-log, or administrative read compromise exposed immediately usable credentials without offline cracking. The fix registers hashing for before_update and avoids rehashing values that already have a bcrypt prefix. This issue is fixed in version 1.9.2.

Affected products

• Netflix lemur: before 1.9.2

References

• https://github.com/Netflix/lemur/commit/221c6d7275ac667bb8898ab48d2b96926a89c1c4
• https://github.com/Netflix/lemur/releases/tag/v1.9.2
• https://github.com/Netflix/lemur/security/advisories/GHSA-q437-g7fv-2jvv
• https://github.com/Netflix/lemur/security/advisories/GHSA-q437-g7fv-2jvv

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