CVE-2026-76504
CRITICALCISA KEVEPSS 78th pctlDescription
A vulnerability in the API session-based authentication management of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to access an affected system with privileges of the admin user. This vulnerability is due to improper handling of URI encoding in an HTTP request, which allows the request to bypass an authentication rule that is intended to restrict access to a specific API endpoint. An attacker could exploit this vulnerability by sending a crafted HTTP request to the API of the affected system. A successful exploit could allow the attacker to bypass authentication and gain access to the API as the admin user.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit Intelligence
Elevated risk: more likely to be exploited than 78% of all known CVEs.
Remediation due: 2026-10-03
References
Related Vulnerabilities
Other CWE-177 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-27780 | High | 7.5 | 2.5% | - | Fix |
| CVE-2018-3718 | Medium | 5.3 | 1.3% | - | Fix |
| CVE-2026-29045 | High | 7.5 | 0.6% | - | Fix |
| CVE-2026-41041 | Critical | 9.1 | 0.6% | - | Fix |
| CVE-2022-3854 | Medium | 6.5 | 0.6% | - | Fix |
| CVE-2026-22031 | High | 8.4 | 0.5% | - | Fix |
Common questions
How do I fix CVE-2026-76504?
Upgrade catalyst sd-wan manager to 20.9.10.1 or later.
Is CVE-2026-76504 being actively exploited?
Yes. CVE-2026-76504 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2026-10-03. Treat it as a priority whatever its CVSS score says.
How severe is CVE-2026-76504?
CVE-2026-76504 has a CVSS v3 base score of 9.8, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-76504 affect?
Published advisories record a fix for catalyst sd-wan manager (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-76504
Markdown
[](https://tridentstack.com/cve/CVE-2026-76504)HTML
<a href="https://tridentstack.com/cve/CVE-2026-76504"><img src="https://tridentstack.com/cve/badge/CVE-2026-76504.svg" alt="CVE-2026-76504"></a>This vulnerability is actively exploited in the wild
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-03.