CVE-2026-20357 Cisco Crosswork Security Hardening Release: August 2026
Attackers can access critical functions without authentication in Cisco Crosswork Planning due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20357?
CVE-2026-20357 is a critical missing authorization vulnerability in Cisco Crosswork Planning, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Crosswork engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20357 are related to missing authentication for critical function issues that are grouped under the Common Weakness Enumeration (CWE) CWE-306.
Weakness: CWE-306
Which versions are affected by CVE-2026-20357?
How do I fix CVE-2026-20357?
No fix has been published for CVE-2026-20357 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-20357 being exploited?
There is no known exploitation of CVE-2026-20357 in the wild and no public exploit code.
Sources
Also known as GHSA-454f-rj63-3rwv.