CVE-2026-73084 activepieces CVE debrief

Who should care

Defenders responsible for Activepieces instances, security teams, and developers using the platform should assess exposure and apply the patch. This includes reviewing compensating controls for exposed systems while remediation is scheduled and verified, checking relevant monitoring, detection, and logs for exposed assets that need extra review, and tracking exceptions, retesting remediated assets, and closing the item only after evidence is documented.

Why it matters

CVE-2026-73084 is a medium-severity vulnerability in Activepieces that allows for JavaScript injection via the /api/redirect OAuth callback endpoint. Defenders should prioritize verifying exposure and applying the patch to prevent potential JavaScript execution and unauthorized access.

• Potential execution of arbitrary JavaScript in the Activepieces origin
• Access to victim's session tokens
• Authenticated API calls on the victim's behalf

Technical summary

The /api/redirect OAuth callback endpoint in Activepieces versions prior to 0.83.0 embeds user-supplied code without proper escaping, allowing for JavaScript injection. This vulnerability could lead to potential execution of arbitrary JavaScript in the Activepieces origin, access to victim's session tokens, and authenticated API calls on the victim's behalf. Defenders should prioritize verifying exposure and applying the patch to prevent potential JavaScript execution and unauthorized access. The official CVE Program record and NVD detail page provide source-provided CVE metadata and vulnerability assessment.

Defensive priority

Defenders should prioritize verifying exposure and applying the patch to prevent potential JavaScript execution.

Recommended defensive actions

• Verify if Activepieces instances are running versions prior to 0.83.0
• Apply the patch by updating to version 0.83.0 or later
• Monitor for suspicious activity on the /api/redirect endpoint
• Review and update authentication and authorization configurations
• 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

Evidence notes

Evidence from the CVE Program and NVD indicates that Activepieces versions prior to 0.83.0 are vulnerable to JavaScript injection via the /api/redirect OAuth callback endpoint. The CVE record was published on 2026-08-11T17:19:16.420Z and has not been modified since then. The official CVE Program record and NVD detail page provide source-provided CVE metadata and vulnerability assessment.

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.