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    CVE-2026-30851

    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.

    Published:Mar 7, 2026
    Last Modified:Apr 16, 2026
    EPS:Mar 7, 2026
    EPSS Score:0.0002
    CVSS Score:8.1

    Affected Products

    Vendor
    Caddyserver
    Product
    Caddy

    Exploits

    https://github.com/caddyserver/caddy/security/advisories/GHSA-7r4p-vjf4-gxv4

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-111 JSON Hijacking (aka JavaScript Hijacking)
    CAPEC-114 Authentication Abuse
    CAPEC-115 Authentication Bypass
    CAPEC-141 Cache Poisoning
    CAPEC-142 DNS Cache Poisoning
    CAPEC-148 Content Spoofing
    CAPEC-151 Identity Spoofing
    CAPEC-194 Fake the Source of Data
    CAPEC-218 Spoofing of UDDI/ebXML Messages
    CAPEC-22 Exploiting Trust in Client
    CAPEC-384 Application API Message Manipulation via Man-in-the-Middle
    CAPEC-385 Transaction or Event Tampering via Application API Manipulation
    CAPEC-386 Application API Navigation Remapping
    CAPEC-387 Navigation Remapping To Propagate Malicious Content
    CAPEC-388 Application API Button Hijacking
    CAPEC-57 Utilizing REST's Trust in the System Resource to Obtain Sensitive Data
    CAPEC-593 Session Hijacking
    CAPEC-633 Token Impersonation
    CAPEC-650 Upload a Web Shell to a Web Server
    CAPEC-665 Exploitation of Thunderbolt Protection Flaws
    CAPEC-701 Browser in the Middle (BiTM)
    CAPEC-94 Adversary in the Middle (AiTM)

    Related CVEs

    CVE-2026-45135 (CVSS 8.1) — Caddy is an extensible server platform that uses TLS by default. From 2.7.0 until 2.11.3, the FastCGI transpor…
    CVE-2026-45692 (CVSS 5.4) — Caddy is an extensible server platform that uses TLS by default. From 2.4.0 until 2.11.3, the authorization la…
    CVE-2026-52845 (CVSS 8.1) — Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, forward_auth copy_headers de…
    CVE-2026-52844 (CVSS 7.5) — Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, on Windows, Caddy path match…
    CVE-2026-52846 (CVSS 4.2) — Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, Caddy’s stripHTML template f…
    CVE-2026-30852 (CVSS 5.5) — Caddy is an extensible server platform that uses TLS by default. From version 2.7.5 to before version 2.11.2, …
    CVE-2026-27590 (CVSS 8.9) — Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's FastCGI path…
    CVE-2026-27589 (CVSS 6.9) — Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admi…
    CVE-2026-27588 (CVSS 7.7) — Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP `host` …
    CVE-2026-27587 (CVSS 7.7) — Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, Caddy's HTTP `path` …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High