At a glance
Low rather than Medium: UK relevance is 40 of 100, little UK-specific signal so far.
Briefing
- Do not treat uncorroborated claims as confirmed breaches.
Questions to ask IT
- Do we run Microsoft Visual Studio, and which versions?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 29 Nov?
Next steps
- Confirm whether this affects systems or suppliers in your estate
Vulnerability facts
Full CVE detail CVE-2026-118147- 7.4 · HighExploitable over the network without any account, under specific conditions, and no one has to click or open anything. High impact on confidentiality and integrity.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Not listed
- ~0.6% 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
- Improper certificate validation in Visual Studio allows an unauthorised attacker to perform spoofing over a network.
Read the original reportMicrosoft Security Update Guide RSS(opens in a new tab)
Products and services involved
- Microsoft Visual Studio98% match confidence · CVE-2026-118147
Pulse
Last change 30 Oct · Recheck overdue since 31 Oct 2026, 19:32 UK time
- Story30 Oct 2026, 19:32 UK time · 30 Oct
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-2026-118147 Visual Studio Spoofing Vulnerability
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
Visual Studio Spoofing Vulnerability
- ProbableSummary fact75% confidence
Improper certificate validation in Visual Studio allows an unauthorised attacker to perform spoofing over a network.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-118147