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CVE-2026-55454— Appsmith: Caddy admin API exposed without authentication

Quick assessment

Affected
appsmithorg appsmith
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Appsmith是Appsmith团队开源的一个用于构建、部署和维护内部应用程序的开源平台。 Appsmith 2.1之前版本存在安全漏洞，该漏洞源于捆绑的Caddy反向代理管理API默认无认证且绑定在0.0.0.0:2019，可通过SSRF驱动，可能导致低权限认证用户替换Caddy配置并接管反向代理。

CVSS 9.9 · Critical EPSS 0.39% · P33

Affected Version Matrix 1

VendorProduct Version RangeStatus
appsmithorg appsmith < 2.1 affected
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I. Basic Information for CVE-2026-55454

Vulnerability Information
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Vulnerability Title
Appsmith: Caddy admin API exposed without authentication
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
暴露危险的方法或函数
Source: CVE Program / CVE List V5
Vulnerability Title
Appsmith 配置错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Appsmith是Appsmith团队开源的一个用于构建、部署和维护内部应用程序的开源平台。 Appsmith 2.1之前版本存在安全漏洞，该漏洞源于捆绑的Caddy反向代理管理API默认无认证且绑定在0.0.0.0:2019，可通过SSRF驱动，可能导致低权限认证用户替换Caddy配置并接管反向代理。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
appsmithorg appsmith < 2.1 -

II. Public POCs for CVE-2026-55454

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III. Intelligence Information for CVE-2026-55454

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Vendor Advisories for CVE-2026-55454 (1)

Same Patch Batch · appsmithorg · 2026-06-24 · 4 CVEs total

CVE-2026-49979 Appsmith: SSRF via `POST /api/v1/admin/send-test-email` — JavaMail Bypasses WebClient IP F
CVE-2026-50189 Appsmith: RCE via Supervisord XML-RPC Admin Interface Exposed via /supervisor Caddy Route
CVE-2026-55455 Appsmith: SSRF in REST API / GraphQL datasource plugins via insufficient host denylist

IV. Related Vulnerabilities

Same product: appsmith
Same vendor: appsmithorg
Same weakness: CWE-749

V. Comments for CVE-2026-55454

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