Acronis’ 2026 patch-quality analysis shows that software severity and real-world install behavior are different signals, with Chrome and Adobe PDF standing out as the top testing priorities for SMB Windows fleets. The report also finds that patch risk is concentrated in a small set of products, and that monthly warning rates can swing sharply, so MSPs should combine vendor severity with deployment telemetry before rolling out updates. #GoogleChrome #AdobePDF #MicrosoftWindowsServer #Node.js #MicrosoftEdge #MicrosoftOffice
Keypoints
- About 545,000 patch applications across SMB Windows endpoints were analyzed from January to May 2026.
- 11.2% of patches fell into caution or critical issues categories and required closer review before broad deployment.
- Adobe PDF, Google Chrome, Microsoft Windows Server, and Node.js each had more than 30% of patches flagged for warning review.
- High-severity patches were roughly four times more likely than medium-severity patches to end up in the critical issues category.
- Chrome and Adobe PDF combine high warning rates with meaningful install bases, making them the top testing priorities.
- Microsoft Edge, Microsoft Office, Firefox, and SQL Server showed low warning rates despite broad deployment, so they are generally better suited to standard automation.
- Patch behavior varied month to month, especially for Chrome, showing that MSPs need flexible testing capacity and quarterly refreshes.
MITRE Techniques
- [T1190] Exploit Public-Facing Application – The article notes that Chrome zero-days were actively exploited Windows-targeting issues (‘Chrome zero-days CVE-2025-13223 and CVE-2025-6558 as actively exploited Windows-targeting issues’).
- [T1068] Exploitation for Privilege Escalation – The discussion of patch severity and actively exploited vulnerabilities implies exploitation of flaws before patching (‘actively exploited Windows-targeting issues’).
- [T1552] Unsecured Credentials – Not mentioned.
- [T1036] Masquerading – Not mentioned.
- [T1203] Exploitation for Client Execution – The report references patches and vulnerabilities affecting end-user software such as Chrome and Adobe PDF, where exploitation can lead to code execution (‘a patch that installs cleanly across endpoints is very different from a patch that causes crashes’).
Indicators of Compromise
- [CVE identifiers] Actively exploited browser vulnerabilities – CVE-2025-13223, CVE-2025-6558
- [Software/product names] High-warning or widely deployed products – Google Chrome, Adobe PDF, Microsoft Windows Server, Node.js, Microsoft Edge, Microsoft Office
- [Report / standards references] Risk-based guidance referenced in the article – Acronis Cyberthreats Report H2 2025, NIST SP 800-40 Rev. 4, ISO/IEC 27001:2022 Annex A.8.8
- [Time period] Patch telemetry window analyzed – January 2026, May 2026
Read more: https://www.acronis.com/en/tru/posts/how-patch-quality-varies-by-vendor-across-smb-windows-fleets/