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

> An attacker can execute arbitrary JavaScript in the Activepieces origin via a crafted OAuth redirect, potentially stealing session tokens or performing actions on behalf of logged-in users.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 11 Aug 2026
- **Updated:** 12 Aug 2026
- **Also known as:** GHSA-hc39-cm5m-q8g7

## What is CVE-2026-73084?

CVE-2026-73084 is a medium-severity cross-site scripting vulnerability in activepieces, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-73084?


## How do I fix CVE-2026-73084?

No fix has been published for CVE-2026-73084 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-73084 being exploited?

There is no known exploitation of CVE-2026-73084 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73084 and fix it if it is affected.

What it is: CVE-2026-73084 is a medium-severity cross-site scripting vulnerability in activepieces, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-73084 in the wild and no public exploit code.

Affected product: activepieces. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-73084/ (Markdown: https://insights.sbomify.com/CVE-2026-73084/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73084
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73084
- OSV: https://osv.dev/vulnerability/CVE-2026-73084

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73084/
Summaries are generated and may contain mistakes; the official description above is the record.