CVE-2026-20310 Cisco SD-WAN Software Security Hardening Release - Improper Link Resolution Before File Access
Attackers can exploit improper link resolution to access or modify files on Cisco Catalyst SD-WAN Controller and Manager systems.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20310?
CVE-2026-20310 is a critical path traversal vulnerability in Cisco Catalyst SD-WAN Controller, published on 5 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Catalyst SD-WAN engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20310 are related to improper link resolution before file access issues that are grouped under the Common Weakness Enumeration (CWE) CWE-59.
Weakness: CWE-59
Which versions are affected by CVE-2026-20310?
How do I fix CVE-2026-20310?
No fix has been published for CVE-2026-20310 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-20310 being exploited?
There is no known exploitation of CVE-2026-20310 in the wild and no public exploit code.
Sources
Also known as GHSA-fhhx-46fx-737r.