CVE-2026-20035 Cisco Unity Connection Server-Side Request Forgery Vulnerability
Unauthenticated attackers can exploit improper input validation in the Web Inbox to send arbitrary network requests from the affected device.
- 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-2026-20035?
CVE-2026-20035 is a high-severity server-side request forgery vulnerability in Cisco Unity Connection, published on 6 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the web UI of Cisco Unity Connection Web Inbox could allow an unauthenticated, remote attacker to conduct 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 send arbitrary network requests that are sourced from the affected device.
Weakness: CWE-918
Which versions are affected by CVE-2026-20035?
It affects 1 product.
Products include Cisco Unity Connection.
How do I fix CVE-2026-20035?
No fix has been published for CVE-2026-20035 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-20035 being exploited?
There is no known exploitation of CVE-2026-20035 in the wild and no public exploit code.
Other vulnerabilities in Cisco Unity Connection
Sources
Also known as GHSA-w7jh-xmq5-2m7v.