Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 contains an authentication bypass because a first request preauthenticated with an…
Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 contains an authentication bypass because a first request preauthenticated with an Authorization: Negotiate token authenticates a socket in the globally shared backend connection pool, which is never isolated. Unauthenticated attackers on separate frontend connections can be assigned that NTLM/Kerberos-bound socket and perform reads or writes with the victim's identity.
Read at NIST National Vulnerability Database (CVE API 2.0)
- Vendor
- Microsoft
- Product
- Active Directory / Entra ID, Squid / HAProxy / Varnish
- CVSS
- 8.7
- EPSS
- 0.003 (p22)
- Exposure class
- Identity, Edge / VPN / firewall
Why it ranks 28 (Notable)
- CVSS 8.7 high
- Exposed product class: identity, edge / VPN / firewall
- Widely deployed vendor product (Microsoft)
- Recency: items published within 24 hours gain 15, within 72 hours 6, within 7 days 2.
Links
- NIST National Vulnerability Database (CVE API 2.0) (nvd.nist.gov)
- CVE-2026-114639 on this site · NVD · CVE.org · Vulnpedia
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