Microsoft · Path traversal
Path Traversal in .NET allows an authorized attacker to elevate privileges locally
At a glance
Low rather than Medium: UK relevance is 40 of 100, little UK-specific signal so far.
Briefing
- IT leaders should confirm if.NET 11.0 is in their estate and review the updated KB article links.
Questions to ask IT
- Do we run Microsoft .net, and which versions?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 3 Dec?
Next steps
- Confirm whether this affects systems or suppliers in your estate
Vulnerability facts
Full CVE detail CVE-2026-70161- 7.3 · HighExploitable only with local access and a low-privilege account, but only if a user takes an action, such as opening a file or link. High impact on confidentiality, integrity and availability.CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
- Not listed
- ~0.5% estimated chance of attack in 30 days
- Not linked from the CVE record
- The vulnerability involves improper limitation of a pathname to a restricted directory in.NET.
- No changes to fixed builds were made with the addition of KB article links for.NET 11.0.
Next steps
- Review the advisory against your asset inventory and patch cadence
Summary
- A path traversal vulnerability in.NET allows an authorised attacker to locally elevate privileges.
- An informational update adds KB article links for.NET 11.0 with no changes to fixed builds.
Read the original reportMicrosoft Security Update Guide RSS(opens in a new tab)
Products and services involved
- Microsoft .net84% match confidence · CVE-2026-70161
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Pulse
Last checked 5d ago · Recheck overdue since 4 Nov 2026, 08:04 UK time
- Story15 Oct 2026, 22:43 UK time · 15 Oct
Linked reporting from Microsoft Security Update Guide RSS (vendor psirt).
Read source (Microsoft Security Update Guide RSS) - Signal24 Oct 2026, 17:09 UK time · 24 Oct
in the next 30 days first recorded at 0.5% (lower likelihood signal, not confirmed exploitation).
- Signal3 Nov 2026, 08:04 UK time · 5d ago
in the next 30 days first recorded at 0.5% (lower likelihood signal, not confirmed exploitation).
3 entries so far. The timeline chart appears once this story has more history.
Sources
CVE-2026-70161 .NET Elevation of Privilege Vulnerability
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
Improper limitation of a pathname to a restricted directory ('path traversal') in.NET allows an authorised attacker to elevate privileges locally
- ProbableSummary fact75% confidence
Updated the Security Updates table to add KB article links for.NET 11.0 and download and KB article links for This is an informational change only; the fixed builds are unchanged.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-70161