What is the CVSS score of CVE-2026-27589?

CVE-2026-27589 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2026-27589?

Yes, a public proof-of-concept exploit is available for CVE-2026-27589. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-27589?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify anti-CSRF tokens are enforced.

Caddy CVE-2026-27589

MEDIUM

Cross-Site Request Forgery (CSRF) (CWE-352)

2026-02-24 security-advisories@github.com

GHSA-879p-475x-rqh2

TLS Caddy Suse Caddyserver

6.5

CVSS 3.1 · GitHub Advisory

View

Vulnerability Assessment

Weakness	CWE CWE-352 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V3 - Web Frontend Security Anti-CSRF tokens, SameSite cookies MITRE ATT&CK 1 technique across 1 tactic: Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS 6.5 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: Required. Exploitation requires authentication. Exploitable via local access. Public exploit/POC available.
Exploit ScenarioDerived	An attacker (requires authentication) could exploit this vulnerability to compromise the affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.0% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 12, 2026

Caddy versions prior to 2.11.1 allow unauthenticated cross-origin requests to the admin API when origin enforcement is disabled, enabling attackers to remotely reconfigure the server through malicious web content loaded in a victim's browser. Public exploit code exists for this vulnerability, which can be leveraged to modify HTTP server behavior and admin listener settings without user knowledge. The vulnerability affects Caddy and TLS implementations, with no patch currently available for affected versions.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 6.5

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Affected Packages

go github.com/caddyserver/caddy/v2 fix: 2.11.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in go

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-352 (Cross-Site Request Forgery (CSRF)). Affects Caddy. Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admin API (default listen 127.0.0.1:2019) exposes a state-changing POST /load endpoint that replaces the entire running configuration. When origin enforcement is not enabled (enforce_origin not configured), the admin endpoint accepts cross-origin requests (e.g., from attacker-controlled web content in a victim browser) and applies an attacker-supplied JSON config. This can change the a

Know when Caddy gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

GitHub Advisory PRIMARY 6.5 MEDIUM

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

SUSE MEDIUM

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

PoC Detected

Feb 25, 2026 - 17:08 vuln.today

Public exploit code

CVE Published

Feb 24, 2026 - 17:29 nvd

MEDIUM 6.5

DescriptionGitHub Advisory

Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, the local caddy admin API (default listen 127.0.0.1:2019) exposes a state-changing POST /load endpoint that replaces the entire running configuration. When origin enforcement is not enabled (enforce_origin not configured), the admin endpoint accepts cross-origin requests (e.g., from attacker-controlled web content in a victim browser) and applies an attacker-supplied JSON config. This can change the admin listener settings and alter HTTP server behavior without user intent. Version 2.11.1 contains a fix for the issue.

Executive ViewAI

Why It Matters

Organizations using Caddy should be aware of notable risk from CVE-2026-27589, a cross-site request forgery vulnerability rated CVSS 6.5. Users could be tricked into performing unintended actions. Proof-of-concept code is publicly available. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Moderate

Compensating Controls

Apply vendor patch. If patching is delayed: implement SameSite cookie attributes and anti-CSRF tokens.

Threat Intelligence Overview

EPSS Score

0.0%

Top 97% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS Vendor

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC Yes

EPSS 0.0%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +32

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Affected Products (CPE)GitHub Advisory

cpe:2.3:a:caddyserver:caddy:*:*:*:*:*:*:*:*

More in Caddy

View all

CVE-2023-44487 HIGH Act Now POC

7.5 Oct 10

Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour

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-2026-30851 HIGH This Week POC

8.1 Mar 07

Caddy versions 2.10.0 through 2.11.1 fail to strip client-supplied headers in the forward_auth copy_headers directive, e

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-2022-34037 HIGH This Week POC

7.5 Jul 22

An out-of-bounds read in the rewrite function at /modules/caddyhttp/rewrite/rewrite.go in Caddy v2.5.1 allows attackers

CVE-2026-77281 MEDIUM This Month POC

6.5 Sep 17

A configuration-gated information-disclosure flaw in Caddy 2.11.3 and earlier allows an unauthenticated remote attacker

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

CVE-2017-5963 MEDIUM This Month POC

6.1 Feb 12

An issue was discovered in caddy (for TYPO3) before 7.2.10. Rated medium severity (CVSS 6.1), this vulnerability is remo

CVE-2018-19148 LOW Monitor POC

3.7 Nov 10

Caddy through 0.11.0 sends incorrect certificates for certain invalid requests, making it easier for attackers to enumer

Same weakness CWE-352 – Cross-Site Request Forgery (CSRF)

View all

CVE-2016-6277 HIGH POC

8.8

CVE-2014-100005 HIGH POC

8.0

CVE-2013-5696 MEDIUM POC

6.8

CVE-2020-36836 HIGH POC

8.0

CVE-2015-2295 MEDIUM POC

6.8

CVE-2016-6897 MEDIUM POC

6.5

CVE-2022-41622 HIGH POC

8.8

CVE-2025-2907 CRITICAL POC

9.8

Vendor StatusVendor

SUSE

Severity: Medium

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

References

Advisories & patches

ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0757/ REF https://github.com/caddyserver/caddy/releases/tag/v2.11.1

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back