CVE-2026-55454: CWE-749: Exposed Dangerous Method or Function in appsmithorg appsmith
Appsmith versions prior to 2.1 include a bundled Caddy reverse-proxy with an unauthenticated admin API bound to 0.0.0.0:2019 inside the container. Although this port is not exposed to the host by default, it is accessible from the Appsmith server process or via SSRF vulnerabilities. An authenticated low-privileged user can exploit this to fully replace the live Caddy configuration, effectively taking over the reverse proxy. This critical vulnerability is fixed in version 2.1.
AI Analysis
Technical Summary
Appsmith before version 2.1 bundles a Caddy reverse-proxy whose admin API listens on 0.0.0.0:2019 without authentication inside the container. While docker-compose.yml does not expose this port externally, it remains reachable internally by the Appsmith server or through SSRF vulnerabilities. An authenticated user with low privileges can leverage SSRF to send POST /load or other admin API calls to the Caddy admin endpoint, allowing full replacement of the live Caddy configuration and takeover of the reverse proxy. This vulnerability is addressed in Appsmith 2.1.
Potential Impact
Successful exploitation allows an authenticated low-privileged user to fully control the Caddy reverse proxy configuration, leading to complete compromise of the reverse proxy component. This can result in full control over traffic routing, potential interception or manipulation of data, and disruption of service. The CVSS score of 9.9 reflects critical impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Upgrade Appsmith to version 2.1 or later, where this vulnerability is fixed. Since the vulnerability is resolved in 2.1, applying this official fix is the recommended remediation. No other mitigations are indicated by the vendor advisory.
CVE-2026-55454: CWE-749: Exposed Dangerous Method or Function in appsmithorg appsmith
Description
Appsmith versions prior to 2.1 include a bundled Caddy reverse-proxy with an unauthenticated admin API bound to 0.0.0.0:2019 inside the container. Although this port is not exposed to the host by default, it is accessible from the Appsmith server process or via SSRF vulnerabilities. An authenticated low-privileged user can exploit this to fully replace the live Caddy configuration, effectively taking over the reverse proxy. This critical vulnerability is fixed in version 2.1.
CVSS v3.1
Score 9.9critical
Affected software
pkg:github/appsmithorg/appsmithRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Appsmith before version 2.1 bundles a Caddy reverse-proxy whose admin API listens on 0.0.0.0:2019 without authentication inside the container. While docker-compose.yml does not expose this port externally, it remains reachable internally by the Appsmith server or through SSRF vulnerabilities. An authenticated user with low privileges can leverage SSRF to send POST /load or other admin API calls to the Caddy admin endpoint, allowing full replacement of the live Caddy configuration and takeover of the reverse proxy. This vulnerability is addressed in Appsmith 2.1.
Potential Impact
Successful exploitation allows an authenticated low-privileged user to fully control the Caddy reverse proxy configuration, leading to complete compromise of the reverse proxy component. This can result in full control over traffic routing, potential interception or manipulation of data, and disruption of service. The CVSS score of 9.9 reflects critical impact on confidentiality, integrity, and availability.
Mitigation Recommendations
Upgrade Appsmith to version 2.1 or later, where this vulnerability is fixed. Since the vulnerability is resolved in 2.1, applying this official fix is the recommended remediation. No other mitigations are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T22:10:37.607Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3c501e4853345fc1e45c57
Added to database: 06/24/2026, 21:46:06 UTC
Last enriched: 06/24/2026, 22:01:59 UTC
Last updated: 06/25/2026, 00:27:26 UTC
Views: 38
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