EUVD-2026-61152

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 fetchobjects without a CertificatePermission check. Assigning those objects to...

EUVD-2026-61151

Lemur manages TLS certificate creation. Prior to 1.9.3, validaterevocationurl in lemur/certificates/verify.py checked the original CRL or OCSP URL but the later request could reach a different destination. The CRL requests.get call followed HTTP redirects without validating each Location target, ...

CVE-2026-70667 Lemur: SSRF protection in certificate revocation checking bypassable via HTTP redirects and DNS rebinding (incomplete fix for CVE-2026-55162)

Lemur manages TLS certificate creation. Prior to 1.9.3, validaterevocationurl in lemur/certificates/verify.py checked the original CRL or OCSP URL but the later request could reach a different destination. The CRL requests.get call followed HTTP redirects without validating each Location target, ...

CVE-2026-70667 Lemur: SSRF protection in certificate revocation checking bypassable via HTTP redirects and DNS rebinding (incomplete fix for CVE-2026-55162)

Lemur manages TLS certificate creation. Prior to 1.9.3, validaterevocationurl in lemur/certificates/verify.py checked the original CRL or OCSP URL but the later request could reach a different destination. The CRL requests.get call followed HTTP redirects without validating each Location target, ...

CVE-2026-70667

Netflix Lemur prior to 1.9.3 contains a bypass of its SSRF mitigation in _validate_revocation_url (lemur/certificates/verify.py). Two vectors exist: (1) the CRL requests.get call follows HTTP redirects without re-validating each Location target, allowing an attacker-controlled public URL to redir...

CVE-2026-55164

Netflix Lemur before 1.9.2 stores admin-set passwords in plaintext: lemur.users.service.update() assigns the password directly to User.password without calling hash_password(), and the model only registers a bcrypt before_insert listener, not before_update. A database or backup compromise exposes...

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

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.hashpassword only for the beforeinsert event. Because no beforeupdate listener ran, administrator-initiated...

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

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.hashpassword only for the beforeinsert event. Because no beforeupdate listener ran, administrator-initiated...

CVE-2026-55162 Lemur: Post-authentication SSRF via certificate verification - attacker-controlled CRL and OCSP URLs in uploaded certificates

Lemur manages TLS certificate creation. Prior to 1.9.2, lemur/certificates/verify.py accepted CRL Distribution Point and OCSP responder URLs from uploaded certificate extensions and used them in crlverify and ocspverify without adequate destination validation. An authenticated operator could subm...

CVE-2026-55162

Netflix Lemur versions before 1.9.2 are vulnerable to post-authentication SSRF: lemur/certificates/verify.py passes attacker-controlled CRL Distribution Point and OCSP responder URLs from uploaded certificate extensions directly to requests.get() and openssl ocsp without destination validation, e...

CVE-2026-55162 Lemur: Post-authentication SSRF via certificate verification - attacker-controlled CRL and OCSP URLs in uploaded certificates

Lemur manages TLS certificate creation. Prior to 1.9.2, lemur/certificates/verify.py accepted CRL Distribution Point and OCSP responder URLs from uploaded certificate extensions and used them in crlverify and ocspverify without adequate destination validation. An authenticated operator could subm...

CVE-2026-55166 Lemur: any SSO-authenticated user achieves AWS IAM compromise and permanent PKI key access via ACME acme_url SSRF and creator-equality IDOR

Lemur manages TLS certificate creation. Prior to 1.9.2, authenticated users could influence an ACME authority acmeurl without an effective server-side destination restriction and trigger AcmeHandler.setupacmeclient to make backend requests. An attacker could target cloud instance metadata or...

CVE-2026-55166 Lemur: any SSO-authenticated user achieves AWS IAM compromise and permanent PKI key access via ACME acme_url SSRF and creator-equality IDOR

Lemur manages TLS certificate creation. Prior to 1.9.2, authenticated users could influence an ACME authority acmeurl without an effective server-side destination restriction and trigger AcmeHandler.setupacmeclient to make backend requests. An attacker could target cloud instance metadata or...

CVE-2026-55166

A low-privilege SSO-authenticated user chains three flaws in Netflix Lemur prior to 1.9.2: an unfiltered acme_url SSRF to AWS IMDS (CWE-918) exfiltrates worker STS credentials, while a creator-equality IDOR (CWE-639) at certificates/views.py:734 grants permanent private-key access after ownership...

CVE-2026-55163 Lemur: Privilege escalation via PUT /api/1/roles/<id> — non-admin role members can rewrite role membership

Lemur manages TLS certificate creation. Prior to 1.9.2, PUT /api/1/roles/ in lemur/roles/views.py:298 authorized updates with RoleMemberPermissionroleid, which allowed either an administrator or any existing member of the target role. The handler passed data"users" and data"name" to service.updat...

CVE-2026-55163

Lemur (Netflix TLS certificate management tool) has an authorization bypass in PUT /api/1/roles/ (lemur/roles/views.py:298): RoleMemberPermission uses OR-semantics, so any existing role member can add/remove other users and rename the role. The companion DELETE handler already required admin perm...

CVE-2026-55163 Lemur: Privilege escalation via PUT /api/1/roles/<id> — non-admin role members can rewrite role membership

Lemur manages TLS certificate creation. Prior to 1.9.2, PUT /api/1/roles/ in lemur/roles/views.py:298 authorized updates with RoleMemberPermissionroleid, which allowed either an administrator or any existing member of the target role. The handler passed data"users" and data"name" to service.updat...

CVE-2026-55165

In Lemur 1.9.0 and earlier, lemur/auth/service.py:130-137 reads the alg field from an unverified JWT header and passes it to pyjwt.decode(..., algorithms=[header_data["alg"]]), letting an attacker choose the verification algorithm. PyJWT 2.x blocks alg=none, so direct ATO requires a separate LEMU...

CVE-2026-55165 Lemur : JWT verifier trusts attacker-supplied alg from token header — defense-in-depth gap; chain-dependent ATO with secret disclosure

Lemur manages TLS certificate creation. Prior to 1.9.2, the JWT verifier in lemur/auth/service.py:130-137 used fetchtokenheader to read headerdata"alg" from an unverified token and passed that attacker-controlled value to decodewithmultiplesecrets. PyJWT 2.x rejects alg=none with the configured...

CVE-2026-55165 Lemur : JWT verifier trusts attacker-supplied alg from token header — defense-in-depth gap; chain-dependent ATO with secret disclosure

Lemur manages TLS certificate creation. Prior to 1.9.2, the JWT verifier in lemur/auth/service.py:130-137 used fetchtokenheader to read headerdata"alg" from an unverified token and passed that attacker-controlled value to decodewithmultiplesecrets. PyJWT 2.x rejects alg=none with the configured...