CVE-2026-49979

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

State: Published
Severity: 5.1 Medium
Published: Jun 24, 2026
Updated: Jun 26, 2026
Reserved: Jun 2, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N	GitHub_M

Weaknesses

CWE-209 Generation of Error Message Containing Sensitive Information
CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
appsmithappsmithorg	< 1.99Affected

References

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

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