Lemur: SSRF protection in certificate revocation checking bypassable via HTTP redirects and DNS rebinding (incomplete fix for GHSA-54vg-pfh7-jq95)

SummaryThe SSRF mitigation added for GHSA-54vg-pfh7-jq95 validaterevocationurl in lemur/certificates/verify.py can be bypassed. An operator-role user who uploads a certificate with attacker-controlled CRL/OCSP extensions can still make Lemur reach internal destinations RFC1918, loopback, link-loc...

Lemur: Server-Side Request Forgery via the ACME client following server-controlled URLs

SummaryThe ACME client used to issue certificates from Let's Encrypt / Google Public CA / private ACME CAs connects to an acmeurl, then issues requests to URLs that the ACME server returns in its directory/order/authorization/finalize responses - this is the classic ACME-client SSRF RFC 8555...

PYSEC-2026-3679 Lemur: Incomplete fix for GHSA-v2wp-frmc-5q3v -- ACME authority update endpoint allows non-admin to replace `acme_url` with internal IP, bypassing allowlist

Summary The fix for GHSA-v2wp-frmc-5q3v added validateacmeurl to reject acmeurl values not in ACMEDIRECTORYHOSTALLOWLIST, but the validation is only called at authority creation time POST. The authority update endpoint PUT /api/1/authorities/ accepts and stores arbitrary options -- including a...

PYSEC-2026-3677 Lemur: Sub-CA creation never checks `AuthorityPermission` on the parent authority

Summary Repo under test: https://github.com/Netflix/lemur When ADMINONLYAUTHORITYCREATION=False an explicitly supported and documented configuration, POST /api/1/authorities with type=subca never verifies that the caller holds AuthorityPermission on the supplied parent authority. The parent field...

PYSEC-2026-3678 Lemur: Any user can revoke arbitrary certificates at the CA by uploading a duplicate record and revoking it

Summary Repo under test: https://github.com/Netflix/lemur PUT /api/1/certificates//revoke authorizes the caller against the Lemur database row creator == current user, or CertificatePermission over the row's roles rather than the underlying CA-side certificate identity. Separately, POST...

PYSEC-2026-3673 Lemur: Missing authorization check on POST /certificates/<id>/export for plugins with requires_key = False

Summary The CertificateExport handler in lemur/certificates/views.py nests its entire ownership / CertificatePermission check inside an if plugin.requireskey: branch. When the selected export plugin advertises requireskey = False, the authorization check is skipped entirely and any authenticated...

PYSEC-2026-3676 Lemur: SSRF protection in certificate revocation checking bypassable via HTTP redirects and DNS rebinding (incomplete fix for GHSA-54vg-pfh7-jq95)

Summary The SSRF mitigation added for GHSA-54vg-pfh7-jq95 validaterevocationurl in lemur /certificates/verify.py can be bypassed. An operator-role user who uploads a certificate with attacker-controlled CRL/OCSP extensions can still make Lemur reach internal destinations RFC1918, loopback,...

PYSEC-2026-3680 Lemur: Server-Side Request Forgery via the ACME client following server-controlled URLs

Summary The ACME client used to issue certificates from Let's Encrypt / Google Public CA / private ACME CAs connects to an acmeurl, then issues requests to URLs that the ACME server returns in its directory/order/authorization/finalize responses - this is the classic ACME-client SSRF RFC 8555...

Lemur: Sub-CA creation never checks `AuthorityPermission` on the parent authority

SummaryRepo under test: https://github.com/Netflix/lemurWhen ADMINONLYAUTHORITYCREATION=False an explicitly supported and documented configuration, POST /api/1/authorities with type=subca never verifies that the caller holds AuthorityPermission on the supplied parent authority. The parent field i...

PYSEC-2026-3675 Lemur: Unchecked `replaces[]` lets any user silence notifications and hijack auto-rotation for arbitrary certificates

Summary Repo under test: https://github.com/Netflix/lemur The certificate create and upload endpoints accept a replaces alias replacements array that is resolved to live Certificate ORM objects with no ownership or CertificatePermission check on the referenced certificates. The SQLAlchemy...

Lemur: Any user can revoke arbitrary certificates at the CA by uploading a duplicate record and revoking it

SummaryRepo under test: https://github.com/Netflix/lemurPUT /api/1/certificates//revoke authorizes the caller against the Lemur database row creator == current user, or CertificatePermission over the row's roles rather than the underlying CA-side certificate identity. Separately, POST...

PYSEC-2026-3674 Lemur: Authenticated low-privilege users can read plaintext destination credentials (SFTP password / private-key passphrase) via the destinations API

Summary Lemur's destination read endpoints -- GET /api/1/destinations and GET /api/1/destinations/ -- return the full set of stored plugin option values to any authenticated user, with no authorization check and no redaction of secret-bearing options. The sibling write endpoints POST/PUT/DELETE a...

Lemur: Authenticated low-privilege users can read plaintext destination credentials (SFTP password / private-key passphrase) via the destinations API

SummaryLemur's destination read endpoints -- GET /api/1/destinations and GET /api/1/destinations/ -- return the full set of stored plugin option values to any authenticated user, with no authorization check and no redaction of secret-bearing options. The sibling write endpoints POST/PUT/DELETE ar...

Lemur: Incomplete fix for GHSA-v2wp-frmc-5q3v -- ACME authority update endpoint allows non-admin to replace `acme_url` with internal IP, bypassing allowlist

SummaryThe fix for GHSA-v2wp-frmc-5q3v added validateacmeurl to reject acmeurl values not in ACMEDIRECTORYHOSTALLOWLIST, but the validation is only called at authority creation time POST. The authority update endpoint PUT /api/1/authorities/ accepts and stores arbitrary options -- including a...

Lemur: Missing authorization check on POST /certificates/<id>/export for plugins with requires_key = False

Summary The CertificateExport handler in lemur/certificates/views.py nests its entire ownership / CertificatePermission check inside an if plugin.requireskey: branch. When the selected export plugin advertises requireskey = False, the authorization check is skipped entirely and any authenticated...

Lemur: Unchecked `replaces[]` lets any user silence notifications and hijack auto-rotation for arbitrary certificates

SummaryRepo under test: https://github.com/Netflix/lemurThe certificate create and upload endpoints accept a replaces alias replacements array that is resolved to live Certificate ORM objects with no ownership or CertificatePermission check on the referenced certificates. The SQLAlchemy...

PT-2026-80647

Summary Lemur's destination read endpoints -- GET /api/1/destinations and GET /api/1/destinations/ -- return the full set of stored plugin option values to any authenticated user, with no authorization check and no redaction of secret-bearing options. The sibling write endpoints POST/PUT/DELETE a...

PT-2026-80648

Summary Repo under test: https://github.com/Netflix/lemur The certificate create and upload endpoints accept a replaces alias replacements array that is resolved to live Certificate ORM objects with no ownership or CertificatePermission check on the referenced certificates. The SQLAlchemy...

PT-2026-80646

Summary The CertificateExport handler in lemur/certificates/views.py nests its entire ownership / CertificatePermission check inside an if plugin.requires key: branch. When the selected export plugin advertises requires key = False, the authorization check is skipped entirely and any authenticate...

PT-2026-80650

Summary Repo under test: https://github.com/Netflix/lemur When ADMIN ONLY AUTHORITY CREATION=False an explicitly supported and documented configuration, POST /api/1/authorities with type=subca never verifies that the caller holds AuthorityPermission on the supplied parent authority. The parent...