Vulnerabilities Recent Citrix NetScaler Vulnerability Exploited in the Wild CISA is urging government agencies to immediately patch the Citrix NetScaler vulnerability tracked as CVE-2026-8452. By Eduard Kovacs | August 27, 2026 (12:39 AM ET) Flipboard Reddit Whatsapp Whatsapp Email The Cybersecurity and Infrastructure Security Agency (CISA) is urging government organizations to immediately address a recently patched Citrix NetScaler vulnerability that is being exploited in the wild. The vulnerability is tracked as CVE-2026-8452 and it was one of the several flaws for which Citrix announced patches on June 30. The vendor said the vulnerability can only be exploited against appliances configured as an AAA virtual server or a Gateway VPN server. Versions 14.1-72.61 (FIPS), 13.1-63.18 and 13.1-37.272 fix the security hole. Citrix’s advisory for CVE-2026-8452 describes it as a high-severity memory overflow that can lead to unpredictable or erroneous behavior and DoS attacks. However, cybersecurity firm WatchTowr has analyzed the vulnerability and demonstrated that it can be exploited for unauthenticated remote code execution. WatchTowr made details and PoC code public on August 14. Previdian (formerly KEVIntel) and Defused started seeing in-the-wild exploitation shortly after. The former reported that the attackers had been dropping a web shell and executing discovery commands such as ‘id’ and ‘echo’. Advertisement. Scroll to continue reading. CISA added CVE-2026-8452 to its Known Exploited Vulnerabilities (KEV) catalog on August 26 and instructed agencies to address it by August 29. The advisory from Citrix has yet to be updated to confirm in-the-wild exploitation. This is the second vulnerability exploited in recent months, after the CitrixBleed-like NetScaler vulnerability CVE-2026-8451 , which threat actors started exploiting within 24 hours of its public disclosure. Related : Adobe and Nvidia Patch Dozens of Vulnerabilities Related : CISA Warns of Exploited Gitea Vulnerability Related : CISA Warns of Exploited Oracle WebLogic Vulnerability Related : Chrome 152 Patches Over 300 Vulnerabilities Written By Eduard Kovacs Eduard Kovacs (@EduardKovacs) is senior managing editor at SecurityWeek. He worked as a high school IT teacher before starting a career in journalism in 2011. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering. Daily Briefing Newsletter Subscribe to the SecurityWeek Email Briefing for the latest cybersecurity threats, trends, and expert insights. 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Webinar: Scaling AI Security August 26, 2026 Join this live webinar for a practical framework for evolving your AI security program from a single application to an enterprise AI ecosystem and autonomous agents. Register Webinar: Minimum Viable Business: Can You Prove Your Organization Would Recover? September 2, 2026 In this live webinar, learn how to define your minimum viable business, identify the systems it depends on, measure actual recovery time against business requirements, and present the gaps to the board as measurable risk. Register People on the Move Trellix has named David Pieterse as Chief Operating Officer GTM and David Soto as Chief Information Security Officer. Mike Marshall has been appointed State Chief Information Security Officer at the California Department of Technology. Devi Nair has been appointed Director of Cybersecurity Programs at Aspen Digital. More People On The Move Expert Insights The MFA Identity Trap: When Authentication Creates a False Sense of Security Organizations must distinguish identity verification, authentication and threat detection, or risk successfully authenticating the attackers they are trying to stop. (Torsten George) Silent Patches Don’t Stop Attackers – They Blind Defenders Silent patches can become exploit intelligence for attackers while leaving defenders without the context needed to prioritize risk. (Tod Beardsley) Hired for One Job, Judged on Another: The CISO’s Real Problem The skills that get a CISO hired are rarely the skills they are judged on later. Most security leaders are stuck in that gap. Closing it is the real job. (Sravish Sridhar) Rethinking Application Security for the AI Era As AI dramatically shortens the time from vulnerability disclosure to exploitation, enterprises must look beyond patching to reduce application risk. (Joshua Goldfarb) The AI Governance Gap Is a Leadership Problem: Waiting Won’t Close It Organizations are rushing to implement AI without fully grasping where its legal protections begin and end. (Steve Durbin) Flipboard Reddit Whatsapp Whatsapp Email