Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-55455

Appsmith is a platform to build admin panels, internal tools, and dashboards. Prior to 2.1, the outbound HTTP host filter applied by WebClientUtils (used by the REST API and GraphQL datasource plugins) validates hosts against an exact-match string denylist. The comprehensive address-class check (loopback, any-local, link-local, fc00::/7) exists only on a separate code path used by SMTP, not by the HTTP plugin path. As a result, an authenticated user can craft outbound requests that reach loopback-bound services inside the container. This vulnerability is fixed in 2.1.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 12.5%
CVSS Severity
CVSS v3 Score 9.1
Products affected by CVE-2026-55455


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