What is CVE-2026-49979?

CVE-2026-49979 is a low-severity vulnerability in Appsmith, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 2.7/10. Published 2026-06-24.

How severe is CVE-2026-49979?

Low severity. CVSS v3 base score is 2.7 out of 10.

SSRF in Appsmith

CVE-2026-49979

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.

Published 2026-06-24 · last modified 2026-06-29.

CVSS v3 metric

CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (28.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 28th percentile — 28.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Appsmith
Appsmithorg Appsmith — versions < 1.99

Weakness classification (CWE)

References

github.com/appsmithorg/appsmith/security/advisories/GHSA-vvxf-f8q9-86gh (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-49979?: CVE-2026-49979 is a low-severity vulnerability in Appsmith, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 2.7/10. Published 2026-06-24.
How severe is CVE-2026-49979?: Low severity. CVSS v3 base score is 2.7 out of 10.