Quick answers
- Is CVE-2026-76504 exploited in the wild?
- Yes. CVE-2026-76504 is known to be exploited in the wild, first recorded on 30 September 2026. Treat it as urgent.
- How severe is CVE-2026-76504?
- Critical severity, with a CVSS score of 9.8, published 30 September 2026.
- Which products and versions are affected?
- Cisco Catalyst SD-WAN Manager.
- Is there a fix for CVE-2026-76504?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-76504 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-76504?
- Check whether you run Cisco Catalyst SD-WAN Manager. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability exists in API session-based authentication management due to improper handling of URI encoding in HTTP requests. An attacker can send a crafted HTTP request with encoded characters (e.g., %6a for 'j') to bypass authentication rules protecting specific API endpoints like j_security_check. A successful exploit grants unauthenticated remote access with administrative privileges.
Affected products
- Cisco Catalyst SD-WAN Manager
Timeline
- 2026-09-30: disclosed: Cisco Security Advisory published