CVE-2026-30851

Summary

Caddy is an extensible server platform that uses TLS by default. From version 2.10.0 to before version 2.11.2, forward_auth copy_headers does not strip client-supplied headers, allowing identity injection and privilege escalation. This issue has been patched in version 2.11.2.

Affected Software

Weaknesses

• CWE-287: CWE-287: Improper Authentication
• CWE-345: CWE-345: Insufficient Verification of Data Authenticity

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

References

• https://github.com/caddyserver/caddy/security/advisories/GHSA-7r4p-vjf4-gxv4
• https://github.com/caddyserver/caddy/issues/6610
• https://github.com/caddyserver/caddy/pull/6608
• https://github.com/caddyserver/caddy/pull/7545

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