CVE-2026-5418 appsmithorg CVE debrief

Who should care

Users of Appsmith up to version 1.97 should upgrade to version 1.99 to address the server-side request forgery vulnerability. Affected operators, platforms, vulnerability-management teams, and security teams should review their deployments and implement compensating controls.

Technical summary

The vulnerability is located in the computeDisallowedHosts function of the WebClientUtils.java file in the Appsmith dashboard component. Successful exploitation requires remote access and can lead to server-side request forgery. The CVSS score is 5.5, indicating a medium severity level. The affected component should be upgraded to version 1.99 or later. This issue allows for server-side request forgery and can be exploited remotely. The exploit is publicly available. Upgrading to version 1.99 is recommended. Affected users should review their deployments and implement compensating controls. The vulnerability affects Appsmith up to version 1.97.

Defensive priority

Medium priority due to the CVSS score of 5.5 and the availability of a public exploit.

Recommended defensive actions

• Upgrade Appsmith to version 1.99 or later
• Review and monitor the affected component for potential exploitation attempts
• Implement compensating controls to detect and prevent server-side request forgery attacks
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-04-02T19:21:36.737Z and last modified on 2026-07-24T20:10:00.147Z. The NVD entry is currently Deferred. The vulnerability affects Appsmith up to version 1.97, and the computeDisallowedHosts function in the WebClientUtils.java file is impacted. Users should verify their deployments and review the official advisory for affected scope and severity.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.