Microsoft
Exposure of sensitive information to an unauthorized actor in Windows NTLM allows an unauthorized attacker to perform spoofing over a network
At a glance
~1% estimated chance of attack in 30 days. Exploitation not confirmed.
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 Office, and which versions?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 13 Dec?
Next steps
- Confirm whether this affects systems or suppliers in your estate
Vulnerability facts
Full CVE detail CVE-2026-121680- 7.5 · HighExploitable over the network without any account, and no one has to click or open anything. High impact on confidentiality.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Not listed
- ~1% estimated chance of attack in 30 days
- Not linked from the CVE record
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
- Added Microsoft Office software to the Security Updates table. Customers that are running supported version of Microsoft Office are encouraged to update to the indicated version to be protected from this vulnerability.
- CVE-2026-121680 has an estimated ~1% chance of attack in 30 days (62.2th percentile) as of 2026-11-13 — probability signal, not confirmed exploitation
Read the original reportMicrosoft Security Update Guide RSS(opens in a new tab)
Products and services involved
- Microsoft Office98% match confidence · CVE-2026-121680
Pulse
Last change 1h ago · Next recheck 14 Nov 2026, 23:12 UK time
- Story13 Nov 2026, 23:12 UK time · 1h 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-2026-121680 Windows NTLM Spoofing Vulnerability
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
Exposure of sensitive information to an unauthorised actor in Windows NTLM allows an unauthorised attacker to perform spoofing over a network
- ProbableSummary fact75% confidence
Added Microsoft Office software to the Security Updates table. Customers that are running supported version of Microsoft Office are encouraged to update to the indicated version to be protected from this vulnerability.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-121680
- ConfirmedEstimated attack likelihood95% confidence
CVE-2026-121680 has an estimated ~1% chance of attack in 30 days (62.2th percentile) as of 2026-11-13 — probability signal, not confirmed exploitation