Should you update to Microsoft Edge 155.0.4283.45?
No: install Microsoft Edge 156.0.4314.58 instead. Microsoft Edge 155.0.4283.45 is a security update Microsoft released on 8 Oct 2026 for Mac and Windows. It fixes 212 security flaws, 2 rated critical and 51 important by Microsoft.[1] None of them is known to be used in attacks.
It has since been replaced by Microsoft Edge 155.0.4283.48, released 12 Oct 2026, which includes all of its fixes. If you’re on an older version, install that instead.
Should you update?
No: install Microsoft Edge 156.0.4314.58 instead. Microsoft Edge 156.0.4314.58 came out on 30 Oct 2026 and includes every fix in Microsoft Edge 155.0.4283.45, so there’s no reason to stop at this one. Software Update offers the newest version your device can run.
Is Microsoft Edge 155.0.4283.45 still safe?
Not any more. The 8 updates since, up to Microsoft Edge 156.0.4314.58, fix 493 security flaws that Microsoft Edge 155.0.4283.45 doesn’t, and each became public the day its fix shipped. Installing it is safe: get it only from Edge’s own About page (Edge updates itself; there’s nothing to download from a website), never from a link in an email, text or pop-up.
What it fixes
Microsoft lists 212 security flaws, 2 rated critical and 51 important by Microsoft.[1] The 53 critical and important ones are:
| Flaw | Severity | What Microsoft calls it |
|---|---|---|
CVE-2026-106197 | Critical | Chromium CVE-2026-106197: Use after free |
CVE-2026-106382 | Critical | Chromium CVE-2026-106382: Use after free |
CVE-2026-85899 | Important | Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability |
CVE-2026-96187 | Important | Microsoft Edge (Chromium-based) Information Disclosure Vulnerability |
CVE-2026-96192 | Important | Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability |
CVE-2026-96203 | Important | Microsoft Edge (Chromium-based) Elevation of Privilege Vulnerability |
CVE-2026-102322 | Important | Chromium CVE-2026-102322: Incorrect Authorization |
CVE-2026-106190 | Important | Chromium CVE-2026-106190: Use after free |
CVE-2026-106193 | Important | Chromium CVE-2026-106193: Use after free |
CVE-2026-106202 | Important | Chromium CVE-2026-106202: Uninitialized resource |
CVE-2026-106203 | Important | Chromium CVE-2026-106203: Incomplete cleanup |
CVE-2026-106204 | Important | Chromium CVE-2026-106204: Use after free |
CVE-2026-106211 | Important | Chromium CVE-2026-106211: Use after free |
CVE-2026-106214 | Important | Chromium CVE-2026-106214: Information leak |
CVE-2026-106215 | Important | Chromium CVE-2026-106215: Uninitialized resource |
CVE-2026-106227 | Important | Chromium CVE-2026-106227: Use after free |
CVE-2026-106231 | Important | Chromium CVE-2026-106231: Uninitialized resource |
CVE-2026-106233 | Important | Chromium CVE-2026-106233: Use after free |
CVE-2026-106239 | Important | Chromium CVE-2026-106239: Integer overflow |
CVE-2026-106240 | Important | Chromium CVE-2026-106240: Type confusion |
CVE-2026-106243 | Important | Chromium CVE-2026-106243: Incomplete cleanup |
CVE-2026-106245 | Important | Chromium CVE-2026-106245: Uninitialized resource |
CVE-2026-106248 | Important | Chromium CVE-2026-106248: Use after free |
CVE-2026-106255 | Important | Chromium CVE-2026-106255: Race condition |
CVE-2026-106257 | Important | Chromium CVE-2026-106257: Use after free |
CVE-2026-106258 | Important | Chromium CVE-2026-106258: Uninitialized resource |
CVE-2026-106268 | Important | Chromium CVE-2026-106268: Use after free |
CVE-2026-106269 | Important | Chromium CVE-2026-106269: Use after free |
CVE-2026-106273 | Important | Chromium CVE-2026-106273: Uninitialized resource |
CVE-2026-106278 | Important | Chromium CVE-2026-106278: Use after free |
| and 23 more | ||
How to update, and how long it takes
A minute or two. Edge restarts and reopens your tabs.
- Open Edge and click the three dots (…) at the top right.Choose Help and feedback, then About Microsoft Edge.
- Let it download the update.Edge checks as soon as that page opens. When it’s done, click Restart.
To check it worked: Three dots (…) → Help and feedback → About Microsoft Edge: the version is under the name, e.g. 157.0.4341.42. It should say 155.0.4283.48 or later.
154.0.4258.62 vs 155.0.4283.45
Microsoft Edge 154.0.4258.62, released 5 Oct 2026, fixed 13 security flaws, one already used in attacks. Microsoft Edge 155.0.4283.45 fixes 212 security flaws and includes the fixes before it, so going straight to 155.0.4283.45 gets you both.
- Before: Microsoft Edge 154.0.4258.62, 5 Oct 2026, 13 security flaws
- After: Microsoft Edge 155.0.4283.48, 12 Oct 2026, 34 security flaws
- Microsoft Edge updates, every release and the latest version
- Updates, the latest version of everything HARD tracks
References
- ^ Microsoft. “Microsoft Edge security release notes, October 08, 2026”, 8 Oct 2026.