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.
Advisories
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Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Thu, 25 Jun 2026 14:30:00 +0000
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ssvc
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Thu, 25 Jun 2026 13:30:00 +0000
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| First Time appeared |
Appsmith
Appsmith appsmith |
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| Vendors & Products |
Appsmith
Appsmith appsmith |
Wed, 24 Jun 2026 21:45:00 +0000
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| 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. | |
| Title | Appsmith: SSRF in REST API / GraphQL datasource plugins via insufficient host denylist | |
| Weaknesses | CWE-918 | |
| References |
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| Metrics |
cvssV4_0
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Projects
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-06-25T13:05:39.781Z
Reserved: 2026-06-16T22:10:37.607Z
Link: CVE-2026-55455
Updated: 2026-06-25T13:05:33.445Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-06-25T13:15:03Z
Weaknesses