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VulnerabilityPublished Updated

CVE-2026-49979: appsmithorg appsmith · Generation of Error Message Containing Sensitive Information

Affects appsmithorg appsmithSource CVE Database V5

0
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Not known to be exploited · CVSS 5.1 Medium : upgrade to 1.99 when convenient.

Data as of 6 Nov 2026, 23:24 UTC

CVSS 4.0 base score
5.1Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 30% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.99
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade appsmith and appsmithorg/appsmith to 1.99.

Affected software

ProductAffectedFixed in
appsmithorgappsmithAffected
  • <1.99
Fixed in
  • 1.99
GitHubappsmithorg/appsmithpkg:github/appsmithorg/appsmithOther threatsAffected
  • <1.99
Fixed in
  • 1.99

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade appsmith to version 1.99 or later, where this vulnerability is fixed. There is no indication of a temporary workaround or alternative mitigation. Patch status is confirmed 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.

References

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