CVE-2026-49391 frappe CVE debrief

Who should care

Defenders responsible for Frappe installations, particularly those with user-accessible import interfaces, should assess exposure and apply patches or mitigations as needed. This includes verifying patch application and user access controls, monitoring for suspicious activity, and reviewing compensating controls for exposed systems.

Why it matters

CVE-2026-49391 is a medium-severity vulnerability in Frappe that allows authenticated importers to inject script content, which can execute in other users' sessions. Defenders should prioritize patching, restrict access to the import interface, and monitor for suspicious activity.

• Potential script execution in the context of another user's session
• Possible data tampering or unauthorized actions
• Required verification of patch application and user access controls
• Need for monitoring and incident response preparedness

Technical summary

The vulnerability exists in the Data Import feature of Frappe, where imported column headers are not properly escaped before rendering previews and results. This allows an authenticated importer to inject script content, which can be executed when another user views the import interface. The issue is fixed in versions 16.19.0 and 15.109.0. Defenders should prioritize verifying and applying the available patches to prevent potential script execution. The vulnerability has a CVSS score of 5.1 and is classified as medium-severity.

Defensive priority

Defenders should prioritize verifying and applying the available patches to prevent potential script execution.

Recommended defensive actions

• Verify and apply patches to Frappe versions prior to 16.19.0 and 15.109.0
• Restrict access to the import interface to authorized users only
• Monitor for suspicious activity related to the import interface
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected versions. The vulnerability allows an authenticated importer to inject script content, which can be executed when another user views the import interface. The issue is fixed in versions 16.19.0 and 15.109.0. There is limited information available about the vulnerability, and defenders should verify patch application and user access controls.

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.