CVE-2026-55454

Critical · CVSS 9.9

Appsmith — SSRF to unauthenticated Caddy Admin API RCE / reverse-proxy takeover

CVSS: 9.9; nvd
EPSS: —
KEV: No
Class: other; CWE-749, CWE-1188

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.

Search profile — drives PoC discovery

Symbols POST /loadhttp://0.0.0.0:2019/caddy admin APIreverse-proxy config replaceGHSA-8jvv-gwqg-6vjcCWE-749CWE-1188

Keywords CVE-2026-55454Appsmith SSRF Caddy admin APIAppsmith reverse proxy takeoverCaddy 2019 unauthenticated adminAppsmith low-privilege SSRFAppsmith caddy config replaceGHSA-8jvv-gwqg-6vjcAppsmith pre-2.1 exploitAppsmith caddy 0.0.0.0:2019

Versions: < 2.1

References

Status: enriched · ingested 2026-06-27T00:00:38.000Z · profiled 2026-07-01T18:30:14.000Z