--- title: Windows 10 KB5120249 cumulative update released with fixes description: Microsoft released the Windows 10 KB5120249 cumulative update for versions 22H2 and 21H2 as part of the August 2026 Patch Tuesday. The update brings two key... canonical: https://daily.dev/posts/windows-10-kb5120249-cumulative-update-released-with-fixes-0t6oa8xya twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Windows 10 KB5120249 cumulative update released with fixes | daily.dev og:description: Microsoft released the Windows 10 KB5120249 cumulative update for versions 22H2 and 21H2 as part of the August 2026 Patch Tuesday. The update brings two key... og:url: https://daily.dev/posts/windows-10-kb5120249-cumulative-update-released-with-fixes-0t6oa8xya og:image: https://api.daily.dev/og/posts/0t6oA8XyA.png og:image:alt: Windows 10 KB5120249 cumulative update released with fixes og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Windows 10 KB5120249 cumulative update released with fixes **[BleepingComputer](https://daily.dev/sources/bleepingcomputer)** · 2 min read · 0 upvotes · 0 comments ## Summary Microsoft released the Windows 10 KB5120249 cumulative update for versions 22H2 and 21H2 as part of the August 2026 Patch Tuesday. The update brings two key fixes: resolving a File History backup failure to network shares via SMB that incorrectly reported 'invalid credentials', and expanding Secure Boot certificate rollout to more eligible devices. After installation, OS builds advance to 19045.7663 and 19044.7663. No new issues have been reported with this update. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What does Windows 10 KB5120249 fix? Windows 10 KB5120249 fixes two issues: a File History automatic backup failure to network shares over SMB that incorrectly reported 'invalid credentials' causing scheduled backups to copy no files, and it expands Secure Boot certificate rollout by including additional high-confidence device targeting data. After installation, OS builds reach 19045.7663 (22H2) and 19044.7663 (21H2). _Windows admins tracking Patch Tuesday changes and their impact on managed environments follow these updates on daily.dev._ ## Similar posts on daily.dev - [Windows 11 KB5101684 update released with 42 changes and fixes](https://daily.dev/posts/windows-11-kb5101684-update-released-with-42-changes-and-fixes-qdqjrjdeb) · BleepingComputer · 4 upvotes · 0 comments - [Windows 11 KB5089549 & KB5087420 cumulative updates released](https://daily.dev/posts/windows-11-kb5089549-kb5087420-cumulative-updates-released-aznw5thdt) · BleepingComputer · 0 upvotes · 0 comments - [Microsoft releases Windows 10 KB5082200 extended security update](https://daily.dev/posts/microsoft-releases-windows-10-kb5082200-extended-security-update-6cyidq4j8) · BleepingComputer · 1 upvotes · 1 comments - [Microsoft’s June update fixed 208 security flaws and introduced a cascade of new bugs across all Windows versions](https://daily.dev/posts/microsoft-s-june-update-fixed-208-security-flaws-and-introduced-a-cascade-of-new-bugs-across-all-win-xki0hlkrs) · The Next Web · 1 upvotes · 1 comments --- Tags: [#security](https://daily.dev/tags/security), [#microsoft](https://daily.dev/tags/microsoft), [#windows](https://daily.dev/tags/windows) [View this post on daily.dev](https://daily.dev/posts/windows-10-kb5120249-cumulative-update-released-with-fixes-0t6oa8xya) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Windows 10 KB5120249 cumulative update released with fixes","url":"https://daily.dev/posts/windows-10-kb5120249-cumulative-update-released-with-fixes-0t6oa8xya","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/windows-10-kb5120249-cumulative-update-released-with-fixes-0t6oa8xya"},"datePublished":"2026-08-11T18:30:40.867Z","dateModified":"2026-08-12T00:51:01.571Z","description":"Microsoft released the Windows 10 KB5120249 cumulative update for versions 22H2 and 21H2 as part of the August 2026 Patch Tuesday. 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