EUVD-2026-36790
GHSA-8qv9-6423-m39w
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Network-accessible endpoint with no complexity barriers; low-privilege authentication required; only confidentiality is impacted as no write or availability effect exists.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
2DescriptionCVE.org
Incorrect access control in the "Let's Encrypt" certificate download endpoint of Nginx Proxy Manager v2.14.0 allows authenticated attackers to obtain the TLS private key material via a crafted GET request.
AnalysisAI
Improper access control on the Let's Encrypt certificate download endpoint in Nginx Proxy Manager v2.14.0 exposes TLS private key material to any authenticated user via a crafted GET request. Publicly available exploit code exists per SSVC data (POC linked in references), though EPSS at 0.10% (1st percentile) indicates minimal observed exploitation in the wild and no CISA KEV listing at time of analysis. Successful exploitation allows an attacker with any valid application account to extract private keys for all managed domains - enabling passive traffic decryption, certificate impersonation, or man-in-the-middle attacks against those domains.
Technical ContextAI
Nginx Proxy Manager is a widely self-hosted web GUI that wraps nginx reverse proxy configuration and integrates ACME-based Let's Encrypt certificate issuance and renewal. The affected endpoint in v2.14.0 is responsible for allowing administrators to download issued certificate bundles, which include the private key. CWE-284 (Improper Access Control) identifies the root cause: the endpoint validates session authentication (consistent with PR:L in the CVSS vector) but applies no role or privilege check, meaning any authenticated principal - regardless of their intended access tier - can invoke the endpoint and retrieve key material. The NVD CPE entry (cpe:2.3:a:n/a:n/a:*:*:*:*:*:*:*:*) is non-specific and provides no version bounding; the affected release is established solely from the CVE description. The ENISA EUVD record (EUVD-2026-36790) corroborates the finding but also records affected versions as unspecified.
RemediationAI
No vendor-released patch with a confirmed fix version has been identified at time of analysis - patch availability should be monitored via the Nginx Proxy Manager GitHub repository and official release channels. Immediately after becoming aware of potential exploitation, revoke and reissue all Let's Encrypt certificates managed through affected v2.14.0 instances, as compromised private keys cannot be protected retroactively by patching. As a compensating control, restrict access to the Nginx Proxy Manager administrative interface to the minimum necessary set of trusted user accounts, reducing the population of principals that could invoke the vulnerable endpoint - note this requires reviewing all existing accounts for necessity. Where network architecture permits, apply firewall or reverse-proxy rules to limit access to the Nginx Proxy Manager management port to specific trusted IP ranges, accepting the operational trade-off of reduced administrative flexibility. Review application access logs for unexpected requests to the Let's Encrypt certificate download endpoint to identify potential prior exploitation. The advisory at https://nvd.nist.gov/vuln/detail/CVE-2026-50892 should be checked regularly for patch updates.
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today