CVE-2026-21520 Copilot Studio Information Disclosure Vulnerability
Unauthenticated attackers can view sensitive information in Microsoft Copilot Studio via network access, requiring a vendor patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21520?
CVE-2026-21520 is a high-severity vulnerability in Microsoft Copilot Studio, published on 22 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network attack vector
Weakness: CWE-77
Which versions are affected by CVE-2026-21520?
It affects 1 product.
Products include Microsoft Copilot Studio.
How do I fix CVE-2026-21520?
No fix has been published for CVE-2026-21520 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-21520 being exploited?
There is no known exploitation of CVE-2026-21520 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Copilot Studio
Sources
Also known as GHSA-5vx4-v4r5-wrxg.