CVE-2026-49979 — Appsmith: SSRF via `POST /api/v1/admin/send-test-email` — JavaMail Bypasses WebClient IP Filter

Description (CNA)

Appsmith is a platform to build admin panels, internal tools, and dashboards. Prior to 1.99, the POST /api/v1/admin/send-test-email endpoint accepts attacker-controlled smtpHost and smtpPort values and establishes a raw JavaMail TCP connection without any IP validation. This completely bypasses WebClientUtils.IP_CHECK_FILTER, which only applies to Spring WebClient HTTP requests. Additionally, the raw MailException.getMessage() is returned verbatim in the API error response, enabling error-based internal port scanning and service banner enumeration. This vulnerability is fixed in 1.99.

Affected (CNA)

Vendor / product	Versions
appsmithorg / appsmith	affected < 1.99

CWE

CWE-209, CWE-918

References

https://github.com/appsmithorg/appsmith/security/advisories/GHSA-vvxf-f8q9-86gh

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.