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CVE-2026-30851 - Vulnerability Analysis

HighCVSS: 8.1

Last Updated: March 7, 2026

Caddy - Broken Access Control

Published: March 7, 2026Updated: March 7, 2026Remote Exploitable

Overview

Caddy 2.10.0 to < 2.11.2 contains a broken access control vulnerability caused by forward_auth copy_headers not stripping client-supplied headers, letting attackers perform identity injection and privilege escalation, exploit requires client to supply crafted headers.

Severity & Score

Severity: High

CVSS Score: 8.1

Impact

Attackers can escalate privileges by injecting identities via client-supplied headers, compromising access control.

Mitigation

Upgrade to version 2.11.2 or later.

References

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

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Details

CVE ID: CVE-2026-30851
Severity: High
CVSS Score: 8.1
Type: broken_access_control
Status: new

CWE

CWE-287

CVSS Metrics

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N