CVE-2026-21520

CVE Enrichment

CVSS: 7.5 HIGH
EPSS: 1.53%
EPSS Percentile: 74.88%
CISA KEV: Not listed

Description

Exposure of Sensitive Information to an Unauthorized Actor in Copilot Studio allows a unauthenticated attacker to view sensitive information through network attack vector

Technical Details

CVSS Version: 3.1
CNA / NVD Source: [email protected]
Published: 23-Jan-2026 06:15
Last Modified: 17-Jun-2026 17:18
EPSS Date: 2026-11-04
CWE: CWE-77

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:N /
                            S:U /
                            C:H /
                            I:N /
                            A:N

CNA Products / Version Status

Microsoft · Microsoft Copilot Studio Source: CNA · [email protected]
Default status: unknown

- — affected

Affected Products / Versions

microsoft / copilot_studio Source: NVD CPE · affected
Version / affected range: -
cpe:2.3:a:microsoft:copilot_studio:-:*:*:*:*:*:*:*

References

[email protected]

Last enrichment sync: 05-Nov-2026 10:01
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

ð Capsule Security exits stealth with $7M — runtime trust layer for AI agents; disclosed ShareLeak (CVE-2026-21520) and PipeLeak alongside launch Vercel OAuth Breach, Alleged Mythos Access, SIEM Race and Three Defender Zero-Days

CVE (1)

Malware (1)

People (5)

Threat Actors (1)

MITRE ATT&CK (1)

Vendors (10)

Products (6)

Industries (1)

Countries (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.