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CVE-2026-53566 is an out-of-bounds read vulnerability in Citrix Secure Access Client for Windows. It affects versions prior to 26.6.1.20. Successful exploitation allows memory to be read outside the intended buffer boundary, which can expose sensitive process memory contents and may also cause unexpected application behavior or instability. The available information identifies the flaw as a local issue exploitable by a standard user under a specific system configuration, but does not provide the vulnerable function or code path.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An out-of-bounds read vulnerability in Citrix Secure Access Client for Windows that can be exploited by a local low-privileged user when the DNE driver is not installed, impacting confidentiality.
An out-of-bounds memory read vulnerability in Citrix Secure Access Client for Windows that can expose sensitive memory contents under specific conditions.
A Citrix vulnerability addressed in July 2026 affecting Citrix Secure Access Client for Windows and/or Citrix Endpoint Analysis Client for Windows; the specific flaw type is not described in the content.
An out-of-bounds read vulnerability in Citrix Secure Access Client for Windows that could expose sensitive memory contents or cause unexpected application behavior.
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.