CVE-2026-80098: Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate

This month

CRITICAL 9.3REMOTEWATCHLISTMITIGATE

CVE-2026-80098 is a critical-severity flaw (CVSS 9.3) affecting copilot studio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-347
Published	2026-09-03
Last modified	2026-09-08

Publisher (CNA): Microsoft Corporation · Vendor: microsoft

Last updated 2026-09-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-03 23:17 UTCPublished CVE record published
2026-09-08 17:53 UTCUpdated Record last modified

microsoft copilot studio 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 copilot-studio || rpm -q copilot-studio || copilot-studio --version

No fixed or unaffected release known

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

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-2026-80098?

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

Is CVE-2026-80098 being exploited?

CVE-2026-80098 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-2026-80098 affect?

CVE-2026-80098 affects copilot studio. Severity is critical (CVSS 9.3). Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.

How urgent is CVE-2026-80098?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

References

← Back to latest CVEs