CVE-2026-49979: Appsmith is a platform to build admin panels, internal tools, and dashboards

Q: How do I fix CVE-2026-49979?

appsmith: upgrade to 1.99. Exact commands for each OS are on this page.

Q: Is CVE-2026-49979 being exploited?

CVE-2026-49979 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-49979 affect?

CVE-2026-49979 affects appsmith. Severity is low (CVSS 2.7). 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 connect

Q: How urgent is CVE-2026-49979?

Priority 22/100. Public exploit reference

Routine

LOW 2.7UPGRADE

CVE-2026-49979 is a low-severity flaw (CVSS 2.7) affecting appsmith. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 verbati

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	2.7 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-209, CWE-918
Published	2026-06-24
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: appsmith

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-24 22:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

appsmith appsmith UPGRADE

Affected: < 1.99

Fixed in: 1.99

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy appsmith || rpm -q appsmith || appsmith --version

2. UPGRADE to 1.99 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade appsmith

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade appsmith

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-49979?

appsmith: upgrade to 1.99. Exact commands for each OS are on this page.

Is CVE-2026-49979 being exploited?

CVE-2026-49979 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-49979 affect?

CVE-2026-49979 affects appsmith. Severity is low (CVSS 2.7). 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 connect

How urgent is CVE-2026-49979?

Priority 22/100. Public exploit reference

Related CVEs

CVE-2026-55454 CRITICAL 9.9 UPGRADE Appsmith is a platform to build admin panels, internal tools, and dashboards
CVE-2026-55455 CRITICAL 9.1 UPGRADE Appsmith is a platform to build admin panels, internal tools, and dashboards
CVE-2026-50189 HIGH 7.2 UPGRADE Appsmith is a platform to build admin panels, internal tools, and dashboards

References

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