Is CVE-2026-20035 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-20035 being exploited in the wild.

How severe is CVE-2026-20035?

High severity, with a CVSS score of 7.2, published 6 May 2026.

Which products and versions are affected?

Cisco Unity Connection 12.5 and earlier, 14.0 before 14SU5, 15.0 before 15SU4.

Is there a fix for CVE-2026-20035?

A patch was published on 2026-05-06: Fixed in 14SU5 and 15SU4 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-20035 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-20035?

Check whether you run Cisco Unity Connection at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-20035: Cisco Unity Connection SSRF in Web Inbox

CVE-2026-20035 · Severity: high · CVSS 7.2 · Published 2026-05-06

A vulnerability in the Cisco Unity Connection Web Inbox could allow an unauthorized person to use the system as a proxy to send network requests. This feature, which allows users to manage voicemails via a web browser, is enabled by default. An attacker could exploit this to probe internal network resources that are otherwise protected or to mask the origin of malicious traffic, potentially leading to unauthorized data access or further internal attacks.

Technologies: Cisco Unity Connection. Vendors: Cisco.

Quick answers

Is CVE-2026-20035 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-20035 being exploited in the wild.
How severe is CVE-2026-20035?: High severity, with a CVSS score of 7.2, published 6 May 2026.
Which products and versions are affected?: Cisco Unity Connection 12.5 and earlier, 14.0 before 14SU5, 15.0 before 15SU4.
Is there a fix for CVE-2026-20035?: A patch was published on 2026-05-06: Fixed in 14SU5 and 15SU4 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-20035 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-20035?: Check whether you run Cisco Unity Connection at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A Server-Side Request Forgery (SSRF) vulnerability exists in the web UI of Cisco Unity Connection Web Inbox due to improper input validation of specific HTTP requests. An unauthenticated, remote attacker can exploit this by sending a crafted HTTP request to the affected device. A successful exploit allows the attacker to source arbitrary network requests from the device, potentially reaching internal systems or services that are not directly accessible from the external network. The vulnerability is present if the 'Allow Users to Use the Web Inbox and RSS Feeds' feature is enabled (default setting). Cisco has released software updates to address this issue; no workarounds are available.

Affected products

Cisco Unity Connection 12.5 and earlier, 14.0 before 14SU5, 15.0 before 15SU4

Timeline

2026-05-06: advisory: Initial public release by Cisco
2026-05-06: patched: Fixed in 14SU5 and 15SU4

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-unity-rce-ssrf-hENhuASy

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