CVE-2026-20320 Cisco BroadWorks: web page flaw
In plain words: A web app can be made to act on someone's behalf or reach places it should not. Stolen sessions, actions taken as the victim, or access to internal systems.
Confirmed exploited by CISA on · US federal patch deadline Nov 24, 2026
What to do
- Install Cisco's security update for BroadWorks. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Patch edge devices first — attackers often start scanning for them within hours of a fix.
- Never expose the device's admin page to the internet.
- After patching a device that was exposed, follow the vendor's compromise checks, end active sessions and change passwords.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: They face the internet and guard the whole network, so a flaw here can hand attackers a way in — and these devices usually run no antivirus, so break-ins go unnoticed.
The details
- Official name
- Cisco BroadWorks Improper Restriction of XML External Entity Reference Vulnerability
- Product
- Cisco BroadWorks
- CISA description
- Cisco BroadWorks contains an improper restriction of XML external entity reference vulnerability that could allow an unauthenticated, remote attacker to read sensitive configuration information on an affected system.
- Type of flaw
- Web page flaw (CWE-611)
- Confirmed exploited
- Nov 10, 2026
- US federal patch deadline
- Nov 24, 2026
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Answering about CVE-2026-20320 ·
Questions about CVE-2026-20320
Is CVE-2026-20320 being exploited?
Yes. CISA added CVE-2026-20320 to its Known Exploited Vulnerabilities catalog on Nov 10, 2026, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2026-20320?
Install Cisco's security update for BroadWorks. If no update exists, follow the vendor's workaround or stop using the product until one ships. Patch edge devices first — attackers often start scanning for them within hours of a fix.
Am I affected by CVE-2026-20320?
Only if you use Cisco BroadWorks. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.