CVE-2026-20267 Cisco IOS XE Software Security Hardening Release

Critical 9.0 Published 5 Aug 2026 Updated 2 Oct 2026

Cisco IOS XE contains improper access control vulnerabilities allowing attackers to bypass security restrictions, requiring a software update.

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-2026-20267?

CVE-2026-20267 is a critical missing authorization vulnerability in Cisco Ios Xe, published on 5 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 IOS XE Software 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-2026-20267 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-284. 

Weakness: CWE-284

Which versions are affected by CVE-2026-20267?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2026-20267?

No fix has been published for CVE-2026-20267 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-2026-20267 being exploited?

There is no known exploitation of CVE-2026-20267 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-fhmv-662f-c3vp.