CVE-2026-87861
cross-origin reuse of a Negotiate connection
- State
- Published
- Severity
- 9.1 Critical
- Published
- Oct 20, 2026
- Updated
- Oct 30, 2026
- Reserved
- Sep 9, 2026
Description
When using ambient user credentials, an HTTP request directed to one origin may be dispatched over a connection previously authenticated via Negotiate for a different origin, leaving the request's intended credentials unused.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | CISA-ADP |
Weaknesses
- CWE-201 Insertion of Sensitive Information Into Sent Data
Affected Products
| Product | Versions |
|---|---|
curlcurl |
|
References
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