Threadlinqs IntelligenceStart free

VulnerabilityCVE-2026-47645Published 2026-06-19

CVE-2026-47645 — Microsoft 365 Copilot

high

As of 2026-09-24, CVE-2026-47645 is a HIGH-severity vulnerability in Microsoft 365 Copilot, CVSS v3.1 8.8, EPSS 0.7% (53.8th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-47645, most recently “Microsoft September 2026 Cloud Disclosure: 18 Elevation-of-Privilege, Information-Disclosure, and Spoofing Flaws Across Azure and Copilot AI Products, Plus a Windows Secure Kernel EoP (CVE-2026-85921)”.

CVSS v3.1
8.8/10High
EPSS
0.7%Higher than 53.8% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
1Campaigns referencing it
Priority
6.6/10Threadlinqs triage score
Published
Updated 2026-09-24
CVSS v3.1 8.8 (HIGH) · EPSS 0.7% (higher than 53.8% of all scored CVEs) · Priority 6.6/10 · Published 2026-06-19

Last updated:

What is CVE-2026-47645?

Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges over a network.

The record classifies CVE-2026-47645 under weakness class CWE-601. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 127 days ago.

Severity and exploitation probability

CVSS v3.1 base score
8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
EPSS (FIRST)
0.7% probability of exploitation in the next 30 days, higher than 53.8% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
6.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-06-19, last modified 2026-09-24

Is CVE-2026-47645 being exploited?

It currently carries a trending score of 20 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-47645

No vendor patch reference has been recorded for CVE-2026-47645 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-47645

1 tracked threat in the Threadlinqs corpus references CVE-2026-47645, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on .

Vendor advisory and patch