Critical Security Flaw in Cisco Unified Communications Manager Server

First reported on bleepingcomputer on June 27, 2026.

A critical security flaw has been discovered in the Cisco Unified Communications Manager Server, which is being actively exploited by hackers. Users are advised to patch the vulnerability as soon as possible.

What it looks like

• Security alert
• Vulnerability detected

How to fix it

1. Go to the Cisco Unified Communications Manager Server website.
2. Click on the downloads section and select the latest security patch.
3. Download and install the security patch.
4. Restart the server to apply the patch.
5. Check for any additional updates or patches.
6. Contact Cisco support if you need further assistance.

Affected products

• Cisco Unified Communications Manager Server

Sources

• CISA sets urgent deadline to fix Cisco flaw exploited in attacks — rss:bleepingcomputer

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