Missing authorization in Aspire allows an unauthorized attacker to bypass a security feature 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
- Are we affected by CVE-2026-118740, and which of our systems would be?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 11 Dec?
Next steps
- Confirm whether this affects systems or suppliers in your estate
Vulnerability facts
Full CVE detail CVE-2026-118740- 9.1 · CriticalExploitable over the network without any account, and no one has to click or open anything. High impact on confidentiality and integrity.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Not listed
- 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
- Corrected Download links in the Security Updates table.
Read the original reportMicrosoft Security Update Guide RSS(opens in a new tab)
Part of Microsoft security updates address multiple vulnerabilities in ASP.NET Core and .NET
- Insertion of sensitive information into log file in Aspire allows an authorized attacker to disclose information locally
- Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network
- Inefficient algorithmic complexity in ASP.NET Core allows an unauthorized attacker to deny service over a network
- Creation of temporary file in directory with insecure permissions in .NET Aspire allows an authorized attacker to elevate privileges locally
Pulse
Last change 42m ago · Next recheck 12 Nov 2026, 18:03 UK time
- Story11 Nov 2026, 18:03 UK time · 42m 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-2026-118740 Aspire Security Feature Bypass Vulnerability
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
Missing authorisation in Aspire allows an unauthorised attacker to bypass a security feature over a network
- ProbableSummary fact75% confidence
Corrected Download links in the Security Updates table.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-118740