CVE-2026-49979

Low

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.

SeverityLow

CVSS2.7

Exploit probability—

ProductAppsmith

PublishedJun 24, 2026

First seenJun 24, 2026

Weakness typeCWE-209CWE-209 CWE-918Server-side request forgery (SSRF)

How to fix

Update

appsmith appsmith1.99 or later

Affected products

Product	Affected versions	Fixed in
appsmith appsmith	v < 1.99	1.99

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