Search/CVE-2026-87861
● CVE — Critical

CVE-2026-87861

DiscoveredOct 20, 2026UpdatedOct 30, 2026

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.

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CVSS v3.1
9.1 CRITICAL
EPSS
0.27%
probability of exploitation in 30 days
CISA KEV
Not listed
no confirmed exploitation reported
News coverage
0
sources referencing this CVE
Related IOCs
0
seen in the same coverage
Intelligence Reports1
1 intelligence report available

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EPSS Trend
Oct 23, 2026 → Oct 28, 2026
▼ 0.02pp
0.29% → 0.27% over 3 tracked changes
CVSS v3.1 Detail
Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
ConfidentialityHIGH
IntegrityHIGH
AvailabilityNONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Connections
1 relationships
Timeline
disclosure → media coverage
Oct 20, 2026
Disclosure — published as a CVE record. · last revised by NVD Oct 30, 2026