CVE-2026-20035: SSRF in Cisco Unity Connection Web Inbox Web UI
CVE-2026-20035 Published on May 6, 2026
Cisco Unity Connection Server-Side Request Forgery Vulnerability
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.
Vulnerability Analysis
CVE-2026-20035 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a SSRF Vulnerability?
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
CVE-2026-20035 has been classified to as a SSRF vulnerability or weakness.
Products Associated with CVE-2026-20035
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Affected Versions
Cisco Unity Connection:- Version 12.5(1) is affected.
- Version 12.5(1)SU1 is affected.
- Version 12.5(1)SU2 is affected.
- Version 12.5(1)SU3 is affected.
- Version 12.5(1)SU4 is affected.
- Version 14 is affected.
- Version 12.5(1)SU5 is affected.
- Version 14SU1 is affected.
- Version 12.5(1)SU6 is affected.
- Version 14SU2 is affected.
- Version 12.5(1)SU7 is affected.
- Version 14SU3 is affected.
- Version 12.5(1)SU8 is affected.
- Version 14SU3a is affected.
- Version 12.5(1)SU8a is affected.
- Version 15 is affected.
- Version 15SU1 is affected.
- Version 14SU4 is affected.
- Version 12.5(1)SU9 is affected.
- Version 15SU2 is affected.
- Version 15SU3 is affected.