CVE-2026-47645: Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unautho

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HIGH 8.8WATCHLISTMITIGATE

CVE-2026-47645 is a high-severity flaw (CVSS 8.8) affecting 365 copilot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-601
Published	2026-06-19
Last modified	2026-10-25

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-19 21:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

microsoft 365 copilot MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy 365-copilot || rpm -q 365-copilot || 365-copilot --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · rust-opendal-core · FIXED · 0.59.1-2.fc46 · FEDORA-2026-4607543819 · source

sudo dnf upgrade --advisory=FEDORA-2026-4607543819

Fedora ELN · velocitty · FIXED · 1.0.3-2.eln159 · FEDORA-2026-edae8cd295 · source

sudo dnf upgrade --advisory=FEDORA-2026-edae8cd295

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47645?

365 copilot: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-47645 being exploited?

CVE-2026-47645 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47645 affect?

CVE-2026-47645 affects 365 copilot. Severity is high (CVSS 8.8). Url redirection to untrusted site ('open redirect') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to elevate privileges over a network.

How urgent is CVE-2026-47645?

Priority 50/100. High severity; On your watchlist

Related CVEs

CVE-2026-42831 HIGH 7.8 UPGRADE DOWNGRADE Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
CVE-2026-42895 MEDIUM 6.5 MITIGATE Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allow
CVE-2026-41106 CRITICAL 9.3 MITIGATE Url redirection to untrusted site ('open redirect') in M365 Copilot allows an unauthorized attacker to elevate
CVE-2026-58617 HIGH 8.1 UPGRADE Improper access control in Microsoft 365 Copilot for iOS allows an unauthorized attacker to elevate privileges
CVE-2026-50517 CRITICAL 9.9 MITIGATE Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network

References

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