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VULNERABILITIES

CVE-2026-87861 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: CISA-ADPCVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://hackerone.com/reports/3972094 CISA-ADP
https://curl.se/docs/CVE-2026-87861.html curl
https://curl.se/docs/CVE-2026-87861.json curl
https://hackerone.com/reports/3972094 curl

Weakness Enumeration

CWE-IDCWE NameSource
CWE-201Insertion of Sensitive Information Into Sent DataCISA-ADP

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-87861
NVD Published Date:
Oct 20, 2026
NVD Last Modified:
Oct 30, 2026
Source:
curl
CVE-2026-87861 Details - Not Deferred