Exploited vulnerabilities / CVE-2026-20230
Confirmed exploited · server-side request forgery · Cisco Unified Communications ManagerCVE-2026-20230
Cisco Unified Communications Manager server-side request forgery, confirmed exploited in the wild.
Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) contain a server-side request forgery (SSRF) Vulnerability that could allow an unauthenticated, remote attacker to write files to the underlying operating system that could be used later to elevate to root.
| CISA's name for it | Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) Vulnerability |
|---|---|
| Vendor and product | Cisco · Unified Communications Manager |
| Type | server-side request forgery · CWE-918 |
| Exploited | Confirmed by CISA listed 25 June 2026 |
| Likelihood | one of the most likely to be exploited of every vulnerability tracked |
| Deadline | 28 June 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | www.cisco.com ↗ · www.cisa.gov ↗ · www.cisa.gov ↗ · nvd.nist.gov ↗ |
Three steps, in this order
Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited.
If you cannot patch now, restrict network access to the affected product.
Check for signs of compromise since the date it was added to the list.
| CISA's required action | Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. |
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Know before someone else finds it
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CVE-2026-20230 in short
Is CVE-2026-20230 being exploited?
Yes. CISA added CVE-2026-20230 to its Known Exploited Vulnerabilities catalogue on 25 June 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2026-20230?
US federal agencies must remediate it by 28 June 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2026-20230 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 89%, the 99th percentile of every CVE it scores.
How do I fix CVE-2026-20230?
Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited. If you cannot patch now, restrict network access to the affected product. Check for signs of compromise since the date it was added to the list.
Other Cisco vulnerabilities being exploited
| CVE | Product | Type | Listed |
|---|---|---|---|
| CVE-2026-20320 | BroadWorks | exploited vulnerability | 10 November 2026 |
| CVE-2026-76418 | Secure Firewall ASA Software and Cisco Secure FTD Software | denial of service | 29 October 2026 |
| CVE-2026-76519 | Secure Email Gateway | path traversal | 14 October 2026 |
| CVE-2026-76504 | Catalyst SD-WAN Manager | privilege escalation | 30 September 2026 |
| CVE-2026-76460 | Identity Services Engine | privilege escalation | 16 September 2026 |
| CVE-2026-76461 | Secure Email Gateway | SQL injection | 14 September 2026 |
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.