CVE-2026-80098
CVE-2026-80098 is a critical-severity vulnerability in Microsoft Copilot Studio with a CVSS 3.x base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-347.
Key facts
- Severity: Critical (CVSS 3.x base score 9.3)
- EPSS exploit prediction: 0% (40th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-347
- Affected product: Microsoft Copilot Studio
- Published:
- Last modified:
Description
Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.
Frequently asked questions
- What is CVE-2026-80098?
- Improper verification of cryptographic signature in Copilot Studio allows an unauthorized attacker to elevate privileges over a network.
- How severe is CVE-2026-80098?
- CVE-2026-80098 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability none.
- Is CVE-2026-80098 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-80098?
- CVE-2026-80098 affects Microsoft Copilot Studio. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-80098?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2026-80098 published?
- CVE-2026-80098 was published on 2026-09-03 and last updated on 2026-09-08.
References
Affected products (1)
- cpe:2.3:a:microsoft:copilot_studio:-:*:*:*:*:*:*:*
More vulnerabilities in Microsoft Copilot Studio
- CVE-2024-49038 — Critical (CVSS 9.3): Improper neutralization of input during web page generation ('Cross-site Scripting') in Copilot Studio by an…
- CVE-2024-38206 — High (CVSS 8.5): An authenticated attacker can bypass Server-Side Request Forgery (SSRF) protection in Microsoft Copilot Studio to leak…
- CVE-2026-21520 — High (CVSS 7.5): Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view…
- CVE-2024-43610 — High (CVSS 7.4): Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view…
All CVEs affecting Microsoft Copilot Studio →
Other CWE-347 (Improper Verification of Cryptographic Signature) vulnerabilities
- CVE-2026-5430 — Critical (CVSS 10.0): The JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured or…
- CVE-2026-56451 — Critical (CVSS 10.0): A vulnerability has been identified in Opcenter X (All versions < V2604). Affected applications do not properly…
- CVE-2026-48558 — Critical (CVSS 10.0): SimpleHelp versions 5.5.15 and prior and 6.0 pre-release versions contain an authentication bypass vulnerability in the…
- CVE-2023-25574 — Critical (CVSS 10.0): `jupyterhub-ltiauthenticator` is a JupyterHub authenticator for learning tools interoperability (LTI).…
- CVE-2024-45409 — Critical (CVSS 10.0): The Ruby SAML library is for implementing the client side of a SAML authorization. Ruby-SAML in <= 12.2 and 1.13.0 <=…
- CVE-2024-32962 — Critical (CVSS 10.0): xml-crypto is an xml digital signature and encryption library for Node.js. In affected versions the default…
Browse all CWE-347 (Improper Verification of Cryptographic Signature) vulnerabilities →