CVE-2026-55454

Appsmith: Caddy admin API exposed without authentication

State: Published
Severity: 9.9 Critical
Published: Jun 24, 2026
Updated: Jun 25, 2026
Reserved: Jun 16, 2026

Description

Appsmith is a platform to build admin panels, internal tools, and dashboards. Prior to 2.1, the bundled Caddy reverse-proxy's admin API — which has no authentication by default — is bound on 0.0.0.0:2019 inside the container. While this listener is not directly published to the host by docker-compose.yml, it is reachable from the Appsmith server process itself or a SSRF vulnerability. An authenticated low-privileged user can therefore drive the SSRF to issue POST /load (or any other admin-API call) against http://0.0.0.0:2019/, fully replacing the live Caddy configuration and taking over the reverse proxy. This vulnerability is fixed in 2.1.

Scores

CVSS	Score	Vector	Source
3.1	9.9 Critical	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-749 Exposed Dangerous Method or Function
CWE-1188 Insecure Default Initialization of Resource

Affected Products

Product	Versions
appsmithappsmithorg	< 2.1Affected

References

https://github.com/appsmithorg/appsmith/security/advisories/GHSA-8jvv-gwqg-6vjc

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