Is CVE-2026-49979 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-49979 being exploited in the wild.

How severe is CVE-2026-49979?

Informational severity, with a CVSS score of 5.1, published 24 June 2026.

Is there a fix for CVE-2026-49979?

A patch was published on 1.99. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-49979 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-49979?

Check whether you run Appsmith Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-49979: Appsmith SSRF and Information Disclosure in send-test-email endpoint

CVE-2026-49979 · Severity: info · CVSS 5.1 · Published 2026-06-24

Appsmith is a platform used by businesses to build internal admin panels and dashboards. A security flaw in the email configuration tool allows an administrator to bypass internal security filters and probe the company's private network. This could lead to the discovery of sensitive internal services, such as databases or cloud metadata services, which are normally hidden from the internet.

Vendors: Appsmith.

Quick answers

Is CVE-2026-49979 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-49979 being exploited in the wild.
How severe is CVE-2026-49979?: Informational severity, with a CVSS score of 5.1, published 24 June 2026.
Which products and versions are affected?: Appsmith Server < 1.99.
Is there a fix for CVE-2026-49979?: A patch was published on 1.99. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-49979 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-49979?: Check whether you run Appsmith Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A Server-Side Request Forgery (SSRF) vulnerability exists in the 'POST /api/v1/admin/send-test-email' endpoint of Appsmith Server. The application uses JavaMail to establish raw TCP connections to user-supplied 'smtpHost' and 'smtpPort' values without IP validation, effectively bypassing the 'WebClientUtils.IP_CHECK_FILTER' which only applies to HTTP requests. Furthermore, the application returns raw 'MailException' error messages in the API response. An attacker with high privileges (admin) can exploit this to perform error-based port scanning and service banner enumeration of the internal network, including reaching loopback addresses and cloud metadata services (e.g., 169.254.169.254). The issue is resolved in version 1.99.

Affected products

Appsmith Appsmith Server < 1.99

Timeline

2026-04-17: disclosed: Advisory published on GitHub
2026-06-24: advisory: NVD publication date
1.99: patched

References

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

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