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Critical 9.4Published Oct 13, 2026
CVE-2026-88092ASP.NET Core Tampering Vulnerability
Updated under an hour ago ()
Does this affect you?
It affects Microsoft ASP.NET Core 10.0 and 8 other products. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.80%, higher than 56% of scored CVEs.
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Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an unauthorized attacker to perform tampering over a network.
- CVSS
- 9.4 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C
- Weakness (CWE)
- CWE-444
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.80% (percentile 56)
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 13, 2026
Affected products
Microsoft ASP.NET Core 10.0 microsoft:asp.net_core_10.0 (from the name) | from 10.0 before 10.0.13 | CNA record |
Microsoft ASP.NET Core 11.0 microsoft:asp.net_core_11.0 (from the name) | 11.0 builds before 11.0.0-rc.2 | CNA record |
Microsoft ASP.NET Core 8.0 microsoft:asp.net_core_8.0 (from the name) | from 8.0 before 8.0.32 | CNA record |
Microsoft ASP.NET Core 9.0 microsoft:asp.net_core_9.0 (from the name) | from 9.0 before 9.0.21 | CNA record |
Microsoft Microsoft Visual Studio 2022 version 17.14 microsoft:visual_studio_2022_version_17.14 (from the name) | from 17.14.0 before 17.14.42 | CNA record |
Microsoft Microsoft Visual Studio 2026 version 18.10 microsoft:visual_studio_2026_version_18.10 (from the name) | from 18.10.0 before 18.10.4 | CNA record |
microsoft asp.net_core microsoft:asp.net_core | from 8.0.0 before 8.0.32; from 9.0.0 before 9.0.21; from 10.0.0 before 10.0.13; after 11.0.0; 11.0 | NVD |
microsoft visual_studio_2022 microsoft:visual_studio_2022 | from 17.14.0 before 17.14.42 | NVD |
microsoft visual_studio_2026 microsoft:visual_studio_2026 | from 18.10.0 before 18.10.4 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88092vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.