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Appsmith CVE-2026-49979

MEDIUM
Error Message Information Leak (CWE-209)
2026-06-24 GitHub_M
Java Information Disclosure Appsmith
5.1
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
4.1 MEDIUM

Network-reachable admin endpoint; PR:H because admin credentials required; S:C because probing extends to systems beyond Appsmith itself; C:L for internal topology/banner leakage only.

3.1 AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jun 24, 2026 - 22:36 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Server-side request forgery and internal network enumeration in Appsmith (prior to 1.99) is enabled by the POST /api/v1/admin/send-test-email endpoint accepting attacker-controlled smtpHost and smtpPort values, which JavaMail uses to establish raw TCP connections without IP address validation - completely bypassing the application's existing WebClientUtils.IP_CHECK_FILTER. Verbatim MailException error messages are returned in API responses, enabling authenticated administrators (or attackers who have compromised admin credentials) to probe internal network topology, enumerate open ports, and harvest service banners. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain or hold Appsmith admin credentials
Delivery
Authenticate to Appsmith admin API
Exploit
POST to /api/v1/admin/send-test-email with crafted smtpHost and smtpPort
Execution
JavaMail raw TCP connection bypasses IP_CHECK_FILTER
Persist
Read verbatim MailException from API response
Impact
Enumerate internal network hosts and service banners
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Vulnerability AssessmentAI

Exploitation Exploitation requires authenticated Appsmith admin-level access (PR:H per CVSS 4.0 vector) to call the POST /api/v1/admin/send-test-email endpoint with a JSON body supplying arbitrary smtpHost and smtpPort values. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N) scores 5.1 (Medium), which accurately reflects the key limiting factor: exploitation requires high-privilege (admin-level) access to the Appsmith instance. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A malicious or compromised Appsmith administrator submits a POST request to /api/v1/admin/send-test-email with smtpHost set to an internal service address (e.g., 192.168.1.10 or 169.254.169.254) and smtpPort cycling through common service ports (22, 3306, 6443, 8080). JavaMail attempts a raw TCP connection, and the resulting MailException - which may include TCP-level error text or service banner fragments - is returned verbatim in the HTTP response, allowing systematic mapping of internal hosts and open services. …
Remediation Upgrade Appsmith to version 1.99 or later, which is the vendor-confirmed fix per GitHub Security Advisory GHSA-vvxf-f8q9-86gh (https://github.com/appsmithorg/appsmith/security/advisories/GHSA-vvxf-f8q9-86gh). … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-49979 vulnerability details – vuln.today
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