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3451 articles · 142163 vulns · 36/41 feeds (7d)
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7.5
CVE-2026-26164EXPLOITEDPATCHED
microsoft · 365_copilot_chat

M365 Copilot Information Disclosure Vulnerability

Description

Improper neutralization of special elements in output used by a downstream component ('injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Affected Products

VendorProductVersions
microsoft365_copilot_chat-

Also Affects

Downstream vendors/products affected by this vulnerability

VendorProductSourceConfidence
microsoft365 copilotcert_advisory90%

References

  • https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26164(vendor-advisory, patch)

Related News (3 articles)

Tier B
BSI Advisories3d ago
[NEU] [mittel] Microsoft 365 Copilot Business Chat: Mehrere Schwachstellen ermöglichen Offenlegung von Informationen
→ No new info (linked only)
Tier C
VulDB3d ago
CVE-2026-26164 | Microsoft 365 Copilots Business Chat Downstream injection
→ No new info (linked only)
Tier A
Microsoft MSRC4d ago
CVE-2026-26164 M365 Copilot Information Disclosure Vulnerability
→ No new info (linked only)
CVSS 3.17.5 HIGH
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
CISA KEV❌ No
Actively exploited✅ Yes
Patch available
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26164
CWECWE-74
PublishedMay 7, 2026
Last enriched3d agov2
Trending Score43
Source articles3
Independent3
Info Completeness9/14
Missing: title, epss, kev, iocs, mitre_attack

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Verification

State: verified
Confidence: 0%

Vulnerability Timeline

CVE Published
May 7, 2026
Discovered by ZDM
May 7, 2026
Updated: description, exploitAvailable, activelyExploited
May 7, 2026
Actively Exploited
May 8, 2026
Exploit Available
May 8, 2026
Patch Available
May 8, 2026

Version History

v2
Last enriched 3d ago
v2Tier A3d ago

Added a detailed description of the vulnerability and marked it as actively exploited with an exploit available.

descriptionexploitAvailableactivelyExploited
via Microsoft MSRC
v13d ago

Initial creation