Microsoft
Double free in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network
At a glance
Low rather than Medium: UK relevance is 40 of 100, little UK-specific signal so far.
Briefing
There is no written leader briefing for this story yet. These questions come from the facts we hold.
Questions to ask IT
- Do we run Microsoft 365 Apps, Microsoft Office 2021 and Microsoft Office 2024, and which versions?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 10 Dec?
Next steps
- Confirm whether this affects systems or suppliers in your estate
Vulnerability facts
Full CVE detail CVE-2026-97749- 9.8 · CriticalExploitable over the network without any account, and no one has to click or open anything. High impact on confidentiality, integrity and availability.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Not listed
- ~1.2% estimated chance of attack in 30 days
No technical write-up beyond these facts and the summary below yet.
Next steps
- Review the advisory against your asset inventory and patch cadence
Summary
- Updated an acknowledgement. This is an informational change only.
Read the original reportMicrosoft Security Update Guide RSS(opens in a new tab)
Products and services involved
- Microsoft 365 Apps93% match confidence · CVE-2026-97749
- Microsoft Office 202193% match confidence · CVE-2026-97749
- Microsoft Office 202493% match confidence · CVE-2026-97749
Part of Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to elevate privileges ov
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Pulse
Last change 50m ago · Next recheck 11 Nov 2026, 21:10 UK time
- Story10 Nov 2026, 21:10 UK time · 50m ago
Linked reporting from Microsoft Security Update Guide RSS (vendor psirt).
Read source (Microsoft Security Update Guide RSS)
1 entry so far. The timeline chart appears once this story has more history.
Sources
CVE-2026-97749 Microsoft Office Outlook Remote Code Execution Vulnerability
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
Double free in Microsoft Office Outlook allows an unauthorised attacker to execute code over a network
- ProbableSummary fact75% confidence
Updated an acknowledgement. This is an informational change only.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-97749