Dashboard / CVE-2026-78501

CVE-2026-78501

HIGH
MEDIUM Priority: 0.05 BB Relevance: 77/100
Published: 2026-09-17 Modified: 2026-10-31 First seen: 2026-10-30 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact Scope Change

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Changed
C: High
I: None
A: None

Description

Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to disclose information over a network.

Weakness Classification (2)

Affected Software (2)

VendorProductVersion
Microsoft Microsoft 365 Copilot's Business Chat -
Microsoft Microsoft 365 Copilot's Business Chat -

References & Advisories (1)

Bug Bounty Relevance

77 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

8.6 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C

EPSS — Exploitation Probability

0.54%
Raw Score 0.005400
Percentile 45.4%
Date 2026-11-01

EPSS Trend

2026-11-01
0.00540
2026-10-31
0.00540
2026-10-30
0.00540

Intelligence Sources

mitre ref →

External Links