CVE-2026-71308 (GCVE-0-2026-71308)
Vulnerability from cvelistv5 – Published: 2026-08-18 19:00 – Updated: 2026-08-18 19:34
VLAI
EPSS
VEX
Title
Lemur: Unchecked `replaces[]` lets any user silence notifications and hijack auto-rotation for arbitrary certificates
Summary
Lemur manages TLS certificate creation. From 0.5.0 until 1.9.3, certificate create, upload, and edit requests accepted replaces[] or replacements identifiers that AssociatedCertificateSchema resolved with fetch_objects without a CertificatePermission check. Assigning those objects to Certificate.replaces invoked an append listener that disabled the victim certificate notifications and marked it as replaced. The victim was then excluded from get_all_pending_reissue, and certificate_rotate could deploy the attacker certificate to endpoints serving the victim. An authenticated non-read-only user could target certificates for which the user had no ownership or role, suppress lifecycle automation, and cause fleet-wide TLS disruption or unauthorized substitution. The fix authorizes every referenced replacement certificate before mutation. This issue is fixed in version 1.9.3.
Severity
8.1 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 19:34 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Netflix/lemur/security/advisor… | x_refsource_CONFIRM |
| https://github.com/Netflix/lemur/commit/286874535… | x_refsource_MISC |
| https://github.com/Netflix/lemur/releases/tag/v1.9.3 | x_refsource_MISC |
Impacted products
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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