What’s Vulnerable › Vulnerabilities

CVE-2026-73084: Activepieces: Reflected Cross-Site Scripting in OAuth Redirect Endpoint

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-09-09
• Weakness: CWE-79

Description

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.

Affected products

• activepieces: before 0.83.0

References

• https://github.com/activepieces/activepieces/commit/8be4c8d5e6a79ccbaa74815027432a3c8c311385
• https://github.com/activepieces/activepieces/releases/tag/0.83.0
• https://github.com/activepieces/activepieces/security/advisories/GHSA-hc39-cm5m-q8g7

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