🛡️ CVE-2026-55454 — appsmith

🔴 CVSS 9.5 — Critical ⚠️ Exploit Public CWE-749 OSV
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Appsmith: Caddy admin API exposed without authentication

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-55454 is classified as CWE-749: Exposed Dangerous Method or Function. A powerful method is reachable by callers who should not be able to invoke it.

Affected software

CVE-2026-55454 is recorded against 1 package.

  • appsmith

Timeline and source

Published on 29 June 2026 and last revised on 8 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Web)

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE CWE-749
Public Exploit ⚠️ Yes
Source OSV
Published 2026-06-29
Updated 2026-08-12
Modified 2026-07-08
Fix URL N/A

Affected Packages

Software From version Fixed in
appsmith — —

Similar Threats

Exploit Protection

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