gcdRadar
archive/Patch now/AIR-2026-1328
closedclosed 3 Sep 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-80098: Cryptographic signature verification flaw in Microsoft Copilot Studio

copilot studio

Improper cryptographic signature verification in Copilot Studio allows unauthorized attackers to achieve privilege escalation over a network. A patch has been issued by the vendor.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
9.3
EPSS
<0.01 · top 58% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
3 Sep 2026
last update
3 Sep 2026
CVE ids
CVE-2026-80098other records

Timeline · 1

  1. 3 Sep 2026CVE-2026-80098: Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a…

Sources · 1

Advisories and databases

  1. 2026-09-03
    CVE-2026-80098: Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a…
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-80098

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Microsoft
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
privilege-escalation
dates
happened 3 Sep 2026 · first reported 3 Sep 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-80098: Cryptographic signature verification flaw in Microsoft Copilot Studio

https://gcdradar.vercel.app/incidents/cve-2026-80098-cryptographic-signature-verification-flaw-in · AIR-2026-1328 · closed 2026-09-03

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-09-03
- AI role: Attack on AI
- Products: copilot studio
- CVE ids: CVE-2026-80098
- CVSS: 9.3

## Summary

Improper cryptographic signature verification in Copilot Studio allows unauthorized attackers to achieve privilege escalation over a network. A patch has been issued by the vendor.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-09-03: CVE-2026-80098: Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a… (https://nvd.nist.gov/vuln/detail/CVE-2026-80098)

## Sources

- 2026-09-03 NVD: CVE-2026-80098: Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a… https://nvd.nist.gov/vuln/detail/CVE-2026-80098

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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