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CVE-2026-20320 is a high-severity XML External Entity (XXE) vulnerability in the Open Client Interface (OCI) XML Parser of Cisco BroadWorks. The flaw exists because external entity resolution is allowed by default, causing XML input to be parsed unsafely. An unauthenticated remote attacker can exploit the issue by sending a crafted XML message to the Open Client Interface – Provisioning (OCI-P) service. Successful exploitation can cause the affected system to resolve attacker-supplied external entities and disclose sensitive configuration information or other local files accessible to the Cisco BroadWorks user. The issue has also been described as a blind XXE condition in the OCI parser path.
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A high-severity blind XML External Entity (XXE) injection vulnerability in the Cisco BroadWorks Open Client Interface XML Parser that could allow unauthenticated remote attackers to read sensitive configuration data and files from affected systems.
A high-severity XXE-style vulnerability in the Cisco BroadWorks OCI XML parser that allows unauthenticated remote attackers to read sensitive configuration information and files due to external entity resolution being enabled by default.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.