Cisco Catalyst SD-WAN Manager System Account Authorization Bypass Vulnerability
Affects Cisco Catalyst SD-WAN Manager regardless of system configuration. The checked facts list no fixed release, and no vendor severity rating is given.
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: active
- Automatable: yes
- Technical impact: total
Summary
Cisco Catalyst SD-WAN Manager, a network management product, is affected by this vulnerability. A remote attacker without any login credentials could potentially gain administrator-level access to the affected system's API.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
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.
Timeline
- CISA SSVC assessment
Exploitation: active · Automatable: yes · Technical impact: total
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CVE published
- Record last updated
- CISA remediation deadline
Due date for US federal agencies to patch
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- Cisco Cisco Catalyst SD-WAN Manager
20.1.12, 19.2.1, 18.4.4, 18.4.5, 20.1.1.1, 20.1.1, 19.3.0, 19.2.2, 19.2.099, 18.3.6, 18.3.7, 19.2.0, 18.3.8, 19.0.0, 19.1.0, 18.4.302, 18.4.303, 19.2.097, 19.2.098, 17.2.10, 18.3.6.1, 19.0.1a, 18.2.0, 18.4.3, 18.4.1, 17.2.8, 18.3.3.1, 18.4.0, 18.3.1, 17.2.6, and 385 more
References 1
sec.cloudapps.cisco.com
Questions about CVE-2026-76504
What does this mean?
An unauthenticated remote attacker could bypass authentication and gain access to the API as the admin user. The flaw lies in how the system account's authorization is handled.Source: sec.cloudapps.cisco.com
Am I affected, and how do I check?
The advisory says the flaw affects Cisco Catalyst SD-WAN Manager regardless of system configuration. The checked facts list no specific version ranges, so compare the installed manager version with the affected versions in Cisco's advisory.Source: sec.cloudapps.cisco.com
What should I do about it?
The checked facts name no fixed release, so no upgrade target can be given. Follow Cisco's advisory for the fixed version once it is identified.Source: sec.cloudapps.cisco.com
Is it being exploited?
Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-09-30, which means it has evidence of attacks. No public exploit code is tracked.Source: cisa.gov, cve.now feed data
What if there's no patch?
The checked facts include no workaround or mitigation. Consult Cisco's advisory for interim guidance while no fix is available.Source: sec.cloudapps.cisco.com