Critical severity9.1NVD Advisory· Published Jun 24, 2026· Updated Jun 26, 2026
CVE-2026-55455
CVE-2026-55455
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3cpe:2.3:a:appsmith:appsmith:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:appsmith:appsmith:*:*:*:*:*:*:*:*range: <2.1
- (no CPE)range: <2.1
Patches
Vulnerability mechanics
References
1- github.com/appsmithorg/appsmith/security/advisories/GHSA-m23h-pvf3-2m7pnvdThird Party Advisory
News mentions
0No linked articles in our index yet.