Is CVE-2026-30851 actively exploited?

CVE-2026-30851 has no public evidence of in-the-wild exploitation as of 2026-03-11.

What is the CVSS score for CVE-2026-30851?

CVE-2026-30851 has a CVSS score of 8.1 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

How do I patch CVE-2026-30851?

Patch guidance is available from caddyserver security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-30851.

Fix CVE-2026-30851 - HIGH caddyserver 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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack Vector: network
Complexity: low
Privileges: low
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: none
Weaknesses: CWE-287 · Improper Authentication CWE-345

Metadata

Primary Vendor: CADDYSERVER
Published: 3/7/2026
Last Modified: 3/11/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-30851

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary