VDB
CVE-2026-27589
CVE-2026-27589
PUBLISHED
CVSS 6.900000095367432 MEDIUM
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.
EPSS 0.03% · 8.2th percentile
Risk Scores
CVSS v4.0
6.900000095367432
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
EPSS Score
0.03%
8.2th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| caddyserver | caddy | *, 0, < 2.11.1 |
| github.com | caddyserver/caddy/v2 | 0, 0 |
Timeline
- Feb 24, 2026 CVE Published
- Feb 24, 2026 PoC Published
- Feb 25, 2026 EPSS Score
- Feb 25, 2026 PoC Published
- Feb 26, 2026 EPSS Score
- Feb 27, 2026 CVE Updated
- Feb 28, 2026 EPSS Score
- Mar 1, 2026 EPSS Score
- Mar 3, 2026 EPSS Score
- Mar 4, 2026 EPSS Score
- Mar 6, 2026 EPSS Score
- Mar 7, 2026 EPSS Score
References
- https://github.com/caddyserver/caddy/security/advisories/GHSA-879p-475x-rqh2 url
- https://github.com/caddyserver/caddy/releases/tag/v2.11.1 url
- https://github.com/user-attachments/files/25079818/poc.zip url
- https://github.com/user-attachments/files/25079820/PR_DESCRIPTION.md url
- https://nvd.nist.gov/vuln/detail/CVE-2026-27589 advisory
- https://github.com/caddyserver/caddy/commit/65e0ddc22137bbbaa68c842ae0b98d0548504545 url
- https://github.com/caddyserver/caddy package
- https://pkg.go.dev/vuln/GO-2026-4537 url