CVE-2026-55454— Appsmith: Caddy admin API exposed without authentication
Possible ATT&CK Techniques 3AI
T1105 · Ingress Tool Transfer T1190 · Exploit Public-Facing Application T1557 · Adversary-in-the-MiddleAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
暴露危险的方法或函数
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| appsmithorg | appsmith | < 2.1 | - |
II. Public POCs for CVE-2026-55454
| # | POC Description | Source Link | Shenlong Link |
|---|
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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
- CVE-2026-49979
Appsmith: SSRF via `POST /api/v1/admin/send-test-email` — Ja - CVE-2026-55455
Appsmith: SSRF in REST API / GraphQL datasource plugins via - CVE-2026-50189
Appsmith: RCE via Supervisord XML-RPC Admin Interface Expose - CVE-2026-7299
CVE-2026-7299 - CVE-2026-5418
appsmithorg appsmith Dashboard WebClientUtils.java computeDi
Same vendor: appsmithorg
- CVE-2026-49979
Appsmith: SSRF via `POST /api/v1/admin/send-test-email` — Ja - CVE-2026-55455
Appsmith: SSRF in REST API / GraphQL datasource plugins via - CVE-2026-50189
Appsmith: RCE via Supervisord XML-RPC Admin Interface Expose - CVE-2026-5418
appsmithorg appsmith Dashboard WebClientUtils.java computeDi - CVE-2026-30862
Critical Stored XSS & Privilege Escalation in Appsmith
Same weakness: CWE-749
- CVE-2026-54753
Nx: `nx graph` dev server permissive CORS policy - CVE-2026-49993
@nuxt/webpack-builder and @nuxt/rspack-builder dev server sa - CVE-2026-45670
Nuxt: Dev server exposes built source over LAN to malicious - CVE-2026-12060
Hepta Platforms｜Heptabase - Exposed Dangerous - CVE-2026-7516
Lenovo Android Application 安全漏洞
V. Comments for CVE-2026-55454
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