CVE-2026-27589Public exploitNetwork attack vector

Configuration overwrite via cross-origin admin request

Published Feb 24, 2026 · Updated Feb 24, 2026

Cross-site request forgery in Caddy before 2.11.1 allows remote attackers to replace its running configuration through the local admin API. adminLoad.handleLoad accepts a browser's cross-origin POST /load request and applies the supplied JSON configuration when origin enforcement is disabled. Exploitation requires a browser on the Caddy host to visit attacker-controlled content; the resulting configuration write can alter the admin listener, routes, and responses.

CVSS severity6.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in Caddy before 2.11.1 allows remote attackers to replace its running configuration through the local admin API. adminLoad.handleLoad accepts a browser's cross-origin POST /load request and applies the supplied JSON configuration when origin enforcement is disabled. Exploitation requires a browser on the Caddy host to visit attacker-controlled content; the resulting configuration write can alter the admin listener, routes, and responses.

The record

CVE
CVE-2026-27589
Published
Feb 24, 2026
Updated
Feb 24, 2026
Vendor
Caddy
Product
Caddy
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Caddy · Caddyversion=< 2.11.1

Published CVSS scores

6.9GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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