Low severity2.7NVD Advisory· Published Jun 24, 2026· Updated Jun 29, 2026
CVE-2026-49979
CVE-2026-49979
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.
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Affected products
3cpe:2.3:a:appsmith:appsmith:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:appsmith:appsmith:*:*:*:*:*:*:*:*range: <1.99
- (no CPE)range: <1.99
Patches
Vulnerability mechanics
References
1- github.com/appsmithorg/appsmith/security/advisories/GHSA-vvxf-f8q9-86ghnvdExploitThird Party Advisory
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