CVE-2026-20230 Cisco Unified Communications Manager Server-Side Request Forgery (SSRF)
Unauthenticated attackers can exploit SSRF in Cisco Unified CM to write files and escalate privileges to root if WebDialer is enabled.
- Exploited in the wild
- Since 25 Jun 2026
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20230?
CVE-2026-20230 is a high-severity server-side request forgery vulnerability in Cisco Unified Communications Manager, published on 3 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to conduct server-side request forgery (SSRF) attacks through an affected device. This vulnerability is due to improper input validation for specific HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to write files to the underlying operating system that could be used later to elevate to root. Note: Cisco has assigned this security advisory a Security Impact Rating (SIR) of Critical rather than High as the score indicates. The reason is that exploitation of this vulnerability could result in an attacker elevating privileges to root. Note: To exploit this vulnerability, the WebDialer service must be enabled. WebDialer is disabled by default.
Weakness: CWE-918
Which versions are affected by CVE-2026-20230?
It affects 1 product.
Products include Cisco Unified Communications Manager.
How do I fix CVE-2026-20230?
No fix has been published for CVE-2026-20230 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 28 Jun 2026.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-20230 being exploited?
Yes. Attackers have exploited CVE-2026-20230 in the wild since at least 25 Jun 2026.
Public exploit code: 3 proofs of concept on GitHub.
Other vulnerabilities in Cisco Unified Communications Manager
- CVE-2026-20045 Cisco Unified Communications Products Code Injection
- CVE-2025-20309 Cisco Unified Communications Manager Static SSH Credentials Vulnerability
- CVE-2011-1643 Information disclosure in n/a
- CVE-2024-20253 Deserialization in Cisco Packaged Contact Center Enterprise
- CVE-2009-0632 Information disclosure in n/a
Sources
Also known as GHSA-fcv7-pchj-75c2.