Vulnerability · Published Jun 24, 2026 · Assigned by GitHub_M
CVE-2026-55454Appsmith: Caddy admin API exposed without authentication
Critical 9.9
In plain English
A critical-severity security flaw in appsmith from appsmithorg. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| appsmithorg | appsmith | < 2.1 |
Weakness: CWE-749, CWE-1188 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References
- https://github.com/appsmithorg/appsmith/security/advisories/GHSA-8jvv-gwqg-6vjc x_refsource_CONFIRM