What is CVE-2024-49038?

CVE-2024-49038 is a critical-severity vulnerability in Microsoft Copilot Studio, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2024-11-26.

How severe is CVE-2024-49038?

Critical severity. CVSS v3 base score is 9.3 out of 10.

XSS in Microsoft Copilot Studio

CVE-2024-49038

Improper neutralization of input during web page generation ('Cross-site Scripting') in Copilot Studio by an unauthorized attacker leads to elevation of privilege over a network.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2024-11-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.010 (60.1th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2024-49038 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2024-49038?: CVE-2024-49038 is a critical-severity vulnerability in Microsoft Copilot Studio, classified under Cross-site Scripting. CVSS score: 9.3/10. Published 2024-11-26.
How severe is CVE-2024-49038?: Critical severity. CVSS v3 base score is 9.3 out of 10.