CVE-2026-49979 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-49979MEDIUM

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

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   H   N   L   N   N    5.1   .0025   17.2     —

AFFECTED
  Product   Versions  Fixed
  appsmith  < 1.99 –  —

TIMELINE
  Jun 2   Reserved by GitHub_M
  Jun 24  EXPLOIT PUBLISHED — CVE-2026-49979 (appsmithorg appsmith). Public exploit reference added.
  Jun 24  Published (CNA: GitHub_M)

CWE-918, CWE-209 · CNA: GitHub_M · CVSS v4.0 · 1 reference · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 2, 2026	Reserved	Reserved by GitHub_M
June 24, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-49979 (appsmithorg appsmith). Public exploit reference added.
June 24, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
appsmithorg	appsmith	—	< 1.99	—

Weaknesses

CWE-918 · CWE-209

References (1)

https://github.com/appsmithorg/appsmith/security/advisories/GHSA-vvxf-f8q9-86gh [Exploit, Third Party Advisory]

Authoritative record: CVE-2026-49979 at cve.org

Vendors: appsmithorg

Weaknesses: CWE-918 · CWE-209

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-49979 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.