CVE-2026-48508 Lemur: Authorization bypass in StrictRolePermission / AuthorityCreatorPermission

Lemur manages TLS certificate creation. Prior to 1.9.1, StrictRolePermission and AuthorityCreatorPermission in lemur/auth/permissions.py call flaskprincipal.Permission.init with zero Need objects when ADMINONLYAUTHORITYCREATION and LEMURSTRICTROLEENFORCEMENT are unset because both flags default t...

PT-2026-77284

Lemur manages TLS certificate creation. Prior to 1.9.3, POST /api/1/authorities with type=subca did not require AuthorityPermission on the parent authority when ADMIN ONLY AUTHORITY CREATION was false. AssociatedAuthoritySchema resolved the caller-supplied parent and passed it through authority...

PYSEC-2026-2589 Lemur: JWT verifier honors attacker-supplied alg, enabling ATO

Lemur 1.9.0: JWT verifier trusts attacker-supplied alg from token header — defense-in-depth gap; chain-dependent ATO with secret disclosure Vulnerability Summary Field | Value -- | -- Title | Lemur 1.9.0: JWT verifier trusts attacker-supplied alg from token header — defense-in-depth gap;...

PYSEC-2026-2588 Lemur has an authorization bypass in StrictRolePermission / AuthorityCreatorPermission

Summary StrictRolePermission and AuthorityCreatorPermission in lemur/auth/permissions.py call flaskprincipal.Permission.init with zero Needs when their config flags are unset. Both flags defaulted to False in code prior to the fix, so this was the state of any Lemur install that hadn't explicitly...

PYSEC-2026-2591 Lemur Privilege Escalation: Non-admin role members can rewrite role membership via PUT /api/1/roles/<id>

Summary The PUT /api/1/roles/ handler in lemur/roles/views.py gates only on RoleMemberPermissionroleid.can, which is satisfied for any user who is already a member of the target role. The handler then passes data"users" and data"name" directly to service.update, permitting any role member to...

PYSEC-2026-2590 Lemur: LDAP Authentication Globally Disables TLS Certificate Verification When LDAP_USE_TLS Is Enabled

Description Overview When LDAP TLS is enabled LDAPUSETLS = True, Lemur's LDAP authentication module unconditionally disables TLS certificate verification at the global ldap module level. This allows a man-in-the-middle attacker positioned between Lemur and the LDAP server to intercept all...

PYSEC-2026-384 Lemur: ACME SSRF + creator-equality IDOR lead to AWS IAM/PKI compromise

Lemur 1.9.0: any SSO-authenticated user achieves AWS IAM compromise and permanent PKI key access via ACME acmeurl SSRF and creator-equality IDOR Vulnerability Summary Field | Value -- | -- Title | Lemur 1.9.0: any SSO-authenticated user achieves AWS IAM compromise and permanent PKI key access via...

CVE-2026-55165

creationtimestamp| type| source ---|---|--- 2026-06-26 00:35:05+00:00| published-proof-of-concept| https://github.com/Netflix/lemur/security/advisories/GHSA-r9gp-7f88-9r54...

CVE-2026-55166

creationtimestamp| type| source ---|---|--- 2026-06-26 00:35:02+00:00| published-proof-of-concept| https://github.com/Netflix/lemur/security/advisories/GHSA-v2wp-frmc-5q3v 2026-08-18 20:01:28+00:00| seen| https://bsky.app/profile/thehackerwire.bsky.social/post/3mtez2cbezq2m 2026-08-18...

CVE-2026-55162

creationtimestamp| type| source ---|---|--- 2026-06-25 22:35:02+00:00| published-proof-of-concept| https://github.com/Netflix/lemur/security/advisories/GHSA-54vg-pfh7-jq95...

Server-side Request Forgery (SSRF)

Overview lemur is a Certificate management and orchestration service Affected versions of this package are vulnerable to Server-side Request Forgery SSRF through the improper handling of user-supplied URLs in the acmeurl parameter, lack of access control in the certificate key-fetch process, and...

GHSA-V2WP-FRMC-5Q3V Lemur: ACME SSRF + creator-equality IDOR lead to AWS IAM/PKI compromise

Lemur 1.9.0: any SSO-authenticated user achieves AWS IAM compromise and permanent PKI key access via ACME acmeurl SSRF and creator-equality IDOR Vulnerability Summary Field | Value -- | -- Title | Lemur 1.9.0: any SSO-authenticated user achieves AWS IAM compromise and permanent PKI key access via...

GHSA-R9GP-7F88-9R54 Lemur: JWT verifier honors attacker-supplied alg, enabling ATO

Lemur 1.9.0: JWT verifier trusts attacker-supplied alg from token header — defense-in-depth gap; chain-dependent ATO with secret disclosure Vulnerability Summary Field | Value -- | -- Title | Lemur 1.9.0: JWT verifier trusts attacker-supplied alg from token header — defense-in-depth gap;...

GHSA-X3VF-MGXJ-7785 Lemur Privilege Escalation: Non-admin role members can rewrite role membership via PUT /api/1/roles/<id>

Summary The PUT /api/1/roles/ handler in lemur/roles/views.py gates only on RoleMemberPermissionroleid.can, which is satisfied for any user who is already a member of the target role. The handler then passes data"users" and data"name" directly to service.update, permitting any role member to...

Incorrect Authorization

Overview lemur is a Certificate management and orchestration service Affected versions of this package are vulnerable to Incorrect Authorization in the StrictRolePermission and AuthorityCreatorPermission process. An attacker can gain unauthorized access to privileged endpoints by authenticating...

GHSA-QCQW-JWXC-2HQG Lemur has an authorization bypass in StrictRolePermission / AuthorityCreatorPermission

Summary StrictRolePermission and AuthorityCreatorPermission in lemur/auth/permissions.py call flaskprincipal.Permission.init with zero Needs when their config flags are unset. Both flags defaulted to False in code prior to the fix, so this was the state of any Lemur install that hadn't explicitly...

Lemur has an authorization bypass in StrictRolePermission / AuthorityCreatorPermission

Summary StrictRolePermission and AuthorityCreatorPermission in lemur/auth/permissions.py call flaskprincipal.Permission.init with zero Needs when their config flags are unset. Both flags defaulted to False in code prior to the fix, so this was the state of any Lemur install that hadn't explicitly...

PT-2026-52643

Name of the Vulnerable Software and Affected Versions Lemur affected versions not specified Description An authorization bypass exists in the StrictRolePermission and AuthorityCreatorPermission classes within lemur/auth/permissions.py. When the configuration flags LEMUR STRICT ROLE ENFORCEMENT an...

PT-2026-52657

Name of the Vulnerable Software and Affected Versions Lemur versions prior to 1.9.0 Description Lemur is a TLS certificate management service that contains a critical authorization break resulting from a chain of three issues. First, the service auto-provisions new SSO identities as active withou...

CVE-2026-44304

Lemur manages TLS certificate creation. Prior to 1.9.0, Lemur's LDAP authentication module lemur/auth/ldap.py constructs LDAP search filters using unsanitized user input via Python string interpolation. An authenticated LDAP user can inject LDAP filter metacharacters through the username field to...