cve 2026 12457

The cve 2026 12457 tag brings together guidance on a Chromium vulnerability affecting Microsoft Edge. The available discussion explains why Microsoft included the issue in its Security Update Guide: the flaw was found in open-source Chromium code used by Chromium-based Edge. It also notes that Microsoft documented the issue on June 17, 2026, and that updated Edge builds are no longer vulnerable. This page is useful for understanding how a shared browser codebase can create patching responsibilities across vendors, and for checking whether an Edge installation has received the relevant security update. The focus is browser security, Microsoft’s advisory information, and practical patch verification.