Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
appsmithorg appsmith
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Appsmith是Appsmith团队开源的一个用于构建、部署和维护内部应用程序的开源平台。 Appsmith 1.99之前版本存在安全漏洞，该漏洞源于/api/v1/admin/send-test-email端点接受攻击者控制的smtpHost和smtpPort值，且未进行IP验证，导致可能绕过IP检查过滤器，同时API错误响应返回原始MailException.getMessage()，使得攻击者能够进行基于错误的内部端口扫描和服务横幅枚举。

AI Predicted 8.1 Difficulty: Easy EPSS 0.37% · P30

Possible ATT&CK Techniques 1 AI

T1046 · Network Service Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
appsmithorg appsmith < 1.99 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-49979

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Appsmith: SSRF via `POST /api/v1/admin/send-test-email` — JavaMail Bypasses WebClient IP Filter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通过错误消息导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Appsmith 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Appsmith是Appsmith团队开源的一个用于构建、部署和维护内部应用程序的开源平台。 Appsmith 1.99之前版本存在安全漏洞，该漏洞源于/api/v1/admin/send-test-email端点接受攻击者控制的smtpHost和smtpPort值，且未进行IP验证，导致可能绕过IP检查过滤器，同时API错误响应返回原始MailException.getMessage()，使得攻击者能够进行基于错误的内部端口扫描和服务横幅枚举。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
appsmithorg appsmith < 1.99 -

II. Public POCs for CVE-2026-49979

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-49979

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-49979 (1)

Same Patch Batch · appsmithorg · 2026-06-24 · 4 CVEs total

CVE-2026-55454 9.9 CRITICAL Appsmith: Caddy admin API exposed without authentication
CVE-2026-50189 Appsmith: RCE via Supervisord XML-RPC Admin Interface Exposed via /supervisor Caddy Route
CVE-2026-55455 Appsmith: SSRF in REST API / GraphQL datasource plugins via insufficient host denylist

IV. Related Vulnerabilities

Same product: appsmith
Same vendor: appsmithorg
Same weakness: CWE-209