Cisco Patches CVSS 10.0 Secure Workload REST API Flaw Enabling Data Access

Summary

Cisco has released updates to address a critical vulnerability (CVE-2026-20223) in Secure Workload. The flaw stems from insufficient validation and authentication when accessing REST API endpoints, potentially allowing unauthenticated remote attackers to read sensitive information and make configuration changes.

Full text

Cisco Patches CVSS 10.0 Secure Workload REST API Flaw Enabling Data Access Ravie LakshmananMay 22, 2026Vulnerability / Network Security Cisco has rolled out updates for a maximum-severity security flaw impacting Secure Workload that could allow an unauthenticated, remote attacker to access sensitive data. Tracked as CVE-2026-20223 (CVSS score: 10.0), the vulnerability arises from insufficient validation and authentication when accessing REST API endpoints. "An attacker could exploit this vulnerability if they are able to send a crafted API request to an affected endpoint," Cisco said. "A successful exploit could allow the attacker to read sensitive information and make configuration changes across tenant boundaries with the privileges of the Site Admin user." The shortcoming impacts Cisco Secure Workload Cluster Software on SaaS and on-prem deployments, regardless of device configuration. Cisco said there are no workarounds that address the vulnerability. The issue has been addressed in the following versions - Cisco Secure Workload Release 3.9 and earlier (Migrate to a fixed release) Cisco Secure Workload Release 3.10 (Fixed in 3.10.8.3) Cisco Secure Workload Release 4.0 (Fixed in 4.0.3.17) The networking equipment major said it found the vulnerability during internal security testing and that there is no evidence of it being exploited in the wild. The disclosure comes a week after Cisco revealed that another maximum-severity authentication bypass flaw in Catalyst SD-WAN Controller (CVE-2026-20182, CVSS score: 10.0) has been exploited by a threat actor known as UAT-8616 to gain unauthorized access to SD-WAN systems. Found this article interesting? Follow us on Google News, Twitter and LinkedIn to read more exclusive content we post. SHARE     Tweet Share Share Share SHARE  Apex One, CISA, cisco, cybersecurity, Langflow, Trend Micro, Vulnerability ⚡ Top Stories This Week Claude Mythos AI Finds 10,000 High-Severity Flaws in Widely Used Software Megalodon GitHub Attack Targets 5,561 Repos with Malicious CI/CD Workflows ThreatsDay Bulletin: Linux Rootkits, Router 0-Day, AI Intrusions, Scam Kits and 25 New Stories Microsoft Warns of Two Actively Exploited Defender Vulnerabilities 9-Year-Old Linux Kernel Flaw Enables Root Command Execution on Major Distros GitHub Internal Repositories Breached via Malicious Nx Console VS Code Extension GitHub Breached — Employee Device Hack Led to Exfiltration of 3,800+ Internal Repos Microsoft Releases Mitigation for YellowKey BitLocker Bypass CVE-2026-45585 Exploit DirtyDecrypt PoC Released for Linux Kernel CVE-2026-31635 LPE Vulnerability ⚡ Weekly Recap: Exchange 0-Day, npm Worm, Fake AI Repo, Cisco Exploit and More Ivanti, Fortinet, SAP, VMware, n8n Patch RCE, SQL Injection, Privilege Escalation Flaws MiniPlasma Windows 0-Day Enables SYSTEM Privilege Escalation on Fully Patched Systems NGINX CVE-2026-42945 Exploited in the Wild, Causing Worker Crashes and Possible RCE Making Vulnerable Drivers Exploitable Without Hardware - The BYOVD Perspective The New Phishing Click: How OAuth Consent Bypasses MFA Developer Workstations Are Now Part of the Software Supply Chain ⭐ Featured Resources Claim ANY.RUN Anniversary Offer for Faster Malware Analysis [Guide] Learn to Detect AI Typosquatting Risks in Your Domain [Guide] Get Key Identity Security Insights From 2026 Snapshot Discover How to Navigate the Era of Constant Cyber Exposure

Indicators of Compromise

• cve — CVE-2026-20223
• cve — CVE-2026-20182

Entities