CVE-2026-30851

HIGH
2026-03-07 [email protected] GHSA-7r4p-vjf4-gxv4
8.1
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
PoC Detected
Mar 11, 2026 - 13:06 vuln.today
Public exploit code
Patch Released
Mar 11, 2026 - 13:06 nvd
Patch available
CVE Published
Mar 07, 2026 - 17:15 nvd
HIGH 8.1

Tags

Tls Privilege Escalation Caddy

Description

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.

Analysis

Caddy versions 2.10.0 through 2.11.1 fail to strip client-supplied headers in the forward_auth copy_headers directive, enabling authenticated attackers to inject identity headers and escalate privileges. This authentication bypass vulnerability affects deployments relying on Caddy for request forwarding and has public exploit code available. …

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Remediation

Within 24 hours: Identify all systems running Caddy 2.10.0-2.11.1 and audit forward_auth configurations using copy_headers. Within 7 days: Upgrade all affected Caddy instances to version 2.11.2 or later and validate the upgrade in a test environment first. …

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Priority Score

61
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +40
POC: +20

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CVE-2026-30851 vulnerability details – vuln.today
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