CVE-2026-55454CWE-1188CWE-749

Appsmith: Caddy admin API exposed without authentication

Critical · published June 24, 2026

CVSS v3.1
9.9
EPSS
1%
Percentile
48.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.9 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00603 · 48.2th percentile
Weaknesses
CWE-1188 · Initialization of a Resource with an Insecure Default; CWE-749 · Exposed Dangerous Method or Function
Published
2026-06-24T21:38Z
EPSS history
Timeline
  • 24 JUN 21:38Z
    Appsmith: Caddy admin API exposed without authentication
    cvelistv5