What is CVE-2026-55454?

CVE-2026-55454 is a critical-severity vulnerability in Appsmithorg Appsmith, classified under CWE-749. CVSS score: 9.9/10. Published 2026-06-24.

How severe is CVE-2026-55454?

Critical severity. CVSS v3 base score is 9.9 out of 10.

RCE in Appsmithorg Appsmith

CVE-2026-55454

Appsmith is a platform to build admin panels, internal tools, and dashboards. Prior to 2.1, the bundled Caddy reverse-proxy's admin API — which has no authentication by default — is bound on 0.0.0.0:2019 inside the container. While this li…

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Appsmithorg Appsmith — versions < 2.1

Weakness classification (CWE)

CWE-749
CWE-1188 — Initialization of a Resource with an Insecure Default

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-55454?: CVE-2026-55454 is a critical-severity vulnerability in Appsmithorg Appsmith, classified under CWE-749. CVSS score: 9.9/10. Published 2026-06-24.
How severe is CVE-2026-55454?: Critical severity. CVSS v3 base score is 9.9 out of 10.