How severe is CVE-2026-49979?

CVE-2026-49979 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-49979 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-49979?

CVE-2026-49979 affects Appsmith. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-49979?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-49979 have an EU (EUVD) identifier?

Yes. CVE-2026-49979 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39129.

When was CVE-2026-49979 published?

CVE-2026-49979 was published on 2026-06-24 and last updated on 2026-06-29.

CVE-2026-49979

CVE-2026-49979 is a low-severity vulnerability in Appsmith with a CVSS 3.x base score of 2.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: Low (CVSS 3.x base score 2.7)
CVSS v4: 5.1
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-39129
Weakness: CWE-918
Affected product: Appsmith
Published: 2026-06-24
Last modified: 2026-06-29

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-49979?: CVE-2026-49979 has a CVSS 3.x base score of 2.7, rated low severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-49979 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-49979?: CVE-2026-49979 affects Appsmith. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-49979?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-49979 have an EU (EUVD) identifier?: Yes. CVE-2026-49979 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39129.
When was CVE-2026-49979 published?: CVE-2026-49979 was published on 2026-06-24 and last updated on 2026-06-29.

References

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

Affected products (1)

cpe:2.3:a:appsmith:appsmith:*:*:*:*:*:*:*:*

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