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TI-2026-51291 Aliases CVE-2026-73084

Activepieces: Reflected Cross-Site Scripting in OAuth Redirect Endpoint

Priority LOW 27CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting, Code execution
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79 and CWE-94.

Summary

Activepieces is an open source AI workflow automation platform. Prior to 0.83.0, the /api/redirect OAuth callback endpoint embeds the user-supplied code query parameter directly into an inline script block without proper escaping. A crafted request to /api/redirect with a malicious code value can break out of the script context and execute arbitrary JavaScript in the Activepieces origin when a logged-in user opens it. An unauthenticated attacker can access the victim's session tokens or make authenticated API calls on the victim's behalf. This issue is fixed in version 0.83.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00356 29th percentileScored 2026-11-07
Fix Fixed activepieces (activepieces): 0.83.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
activepiecesactivepiecesbefore 0.83.00.83.0Patch availableCNA
  • activepieces Vendoractivepieces Affected before 0.83.0 Fixed in 0.83.0 Patch available CNA

Remediation

  • Fix · CNA activepieces (activepieces) Fixed in 0.83.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-73084

References

Other 3

  • TI-2026-35860 Activepieces: Cross-tenant data exposure and code injection via the Code piece sandbox cache CVSS 4.0CRITICAL 9.3
  • TI-2026-51288 Activepieces: Remote Code Execution via Command Injection in Code Step Name CVSS 4.0HIGH 8.7
  • TI-2026-51290 Activepieces: V8 Isolate Sandbox Bypass via importFresh Module Loading CVSS 4.0HIGH 7.6
  • TI-2026-38608 Activepieces: Arbitrary file write in git-sync via path traversal and symlinks CVSS 4.0MEDIUM 5.9
  • TI-2026-51289 Activepieces: Server-side request forgery in MCP tool validation endpoint CVSS 4.0MEDIUM 5.3
  • TI-2026-38609 Activepieces: Cross-tenant file download via missing JWT audience check on step-files signed URL CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences