CVE-2026-78547: Out-of-Bounds Write

Severity: medium (CVSS 4.4 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-11 · updated 2026-09-16
Weakness: CWE-787

Description

Out-of-bounds write vulnerability in Citrix Citrix Workspace app for Windows. This issue affects Citrix Workspace app for Windows: before 2603.11 Current Release (CR), before 2507.1 LTSR CU3, and before LTSR 2607.

Affected products

Citrix Workspace app for Windows: before 2603.11 Current Release (CR); before 2507.1 LTSR CU3; before LTSR 2607 — fixed in 2507.1 LTSR CU3, 2603.11 Current Release (CR), LTSR 2607

How to fix

Upgrade to a fixed version: Citrix Workspace app for Windows 2507.1 LTSR CU3, 2603.11 Current Release (CR), LTSR 2607. Check the vendor advisory for mitigations.

References

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697034&articleTitle=Citrix_Workspace_app_for_Windows_Security_Bulletin_CVE_2026_78546_and_CVE_2026_78547

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