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

CVE-2026-30851 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

Which versions of TLS are affected by CVE-2026-30851?

Caddy versions 2.10.0 through 2.11.1 contain a critical authentication bypass vulnerability that could allow attackers to impersonate users and escalate privileges by injecting forged headers.. A patch is available.

Is there a public PoC exploit available for CVE-2026-30851?

Yes, a public proof-of-concept exploit is available for CVE-2026-30851. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-30851?

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. Within 30 days: Conduct a security review of authentication logs for suspicious header injection patterns and assess whether any unauthorized access occurred during the vulnerable window.

TLS CVE-2026-30851

HIGH

Improper Authentication (CWE-287)

2026-03-07 security-advisories@github.com

GHSA-7r4p-vjf4-gxv4

TLS Privilege Escalation Caddy Suse

8.1

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

8.1 HIGH

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

SUSE

HIGH

qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

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

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

DescriptionGitHub Advisory

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.

AnalysisAI

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. The vulnerability requires valid authentication credentials but allows complete privilege elevation within affected systems.

Technical ContextAI

Classified as CWE-287 (Improper Authentication). Affects Caddy. 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.

RemediationAI

A vendor patch is available — apply it immediately. Fixed in version 2.11.2.. Restrict network access to the affected service where possible.

More in TLS

View all

CVE-2026-27180 CRITICAL Emergency POC

9.8 Feb 18

MajorDoMo home automation platform is vulnerable to unauthenticated remote code execution through supply chain compromis

CVE-2026-27944 CRITICAL Act Now POC

9.8 Mar 05

Unauthenticated backup download and RCE in Nginx UI before 2.3.3. EPSS 1.0%. PoC available.

CVE-2026-27590 CRITICAL Act Now POC

9.8 Feb 24

FastCGI path splitting vulnerability in Caddy before 2.11.1 allows request smuggling or path confusion when proxying to

CVE-2026-27586 CRITICAL Act Now POC

9.1 Feb 24

TLS error swallowing in Caddy web server before 2.11.1 allows bypassing client certificate authentication. Errors in Cli

CVE-2026-27588 CRITICAL Act Now POC

9.1 Feb 24

Host header case sensitivity bypass in Caddy before 2.11.1. Virtual host routing can be bypassed by using alternate casi

CVE-2026-27587 CRITICAL Act Now POC

9.1 Feb 24

Case sensitivity bypass in Caddy web server path matching before 2.11.1. HTTP path matchers can be bypassed using altern

CVE-2026-25160 CRITICAL Act Now POC

9.1 Feb 04

Alist file manager has an improper certificate validation vulnerability allowing MITM attacks that could compromise file

CVE-2022-40620 HIGH This Week POC

7.7 Jan 28

FunJSQ, a third-party module integrated on some NETGEAR routers and Orbi WiFi Systems, does not properly validate TLS ce

CVE-2026-30852 HIGH This Week POC

7.5 Mar 07

Caddy versions 2.7.5 through 2.11.1 contain a template injection vulnerability in the vars_regexp matcher that allows re

CVE-2026-25961 HIGH This Week POC

7.5 Feb 09

SumatraPDF versions 3.5.0 through 3.5.2 fail to validate TLS certificates during software updates and execute installers

CVE-2025-68133 HIGH This Week POC

7.4 Jan 21

EVerest is an EV charging software stack. In versions 2025.9.0 and below, an attacker can exhaust the operating system's

CVE-2026-27585 MEDIUM This Month POC

6.5 Feb 24

Caddy versions prior to 2.11.1 fail to sanitize backslashes in file path matching, allowing attackers to bypass path-bas

Same weakness CWE-287 – Improper Authentication

View all

CVE-2020-0688 HIGH POC

8.8

CVE-2023-46805 HIGH POC

8.2

CVE-2015-1187 CRITICAL POC

9.8

CVE-2024-7593 CRITICAL POC

9.8

CVE-2017-7921 CRITICAL POC

9.8

CVE-2024-53704 CRITICAL POC

9.8

CVE-2015-7755 CRITICAL POC

9.8

CVE-2013-0625 CRITICAL POC

9.8

Same technique Privilege Escalation

View all

CVE-2025-47812 CRITICAL POC

10.0

CVE-2013-0422 CRITICAL POC

9.8

CVE-2013-0632 CRITICAL POC

9.8

CVE-2017-5689 CRITICAL POC

9.8

CVE-2017-12635 CRITICAL POC

9.8

CVE-2016-10372 CRITICAL POC

9.8

CVE-2014-9583 CRITICAL POC

10.0

CVE-2012-0297 CRITICAL POC

10.0

Vendor StatusVendor

SUSE

Severity: High

Product	Status
openSUSE Leap 15.6	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP5	Fixed
SUSE Linux Enterprise Module for Package Hub 15 SP6	Fixed
openSUSE Leap 15.5	Fixed

CVE-2026-30851 vulnerability details – vuln.today

Back

TLS CVE-2026-30851

Severity by source

CVSS VectorGitHub Advisory

Lifecycle Timeline

DescriptionGitHub Advisory

AnalysisAI

Technical ContextAI

RemediationAI

More in TLS

Same weakness CWE-287 – Improper Authentication

Same technique Privilege Escalation

Vendor StatusVendor

SUSE

Share

External POC / Exploit Code