CVE-2026-40110

high Red Hat
CVSS v3 Base Score
7.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
EPSS Score
0.0%
Exploitation probability in 30 days
Top 99% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Confidentiality
High
Integrity
Low
Availability
None
Published: May 5, 2026 (65 days ago)
Last Modified: May 5, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in Jupyter Server. The Origin header validation, which uses Python's `re.match()` function, does not correctly validate incoming origins against allowed patterns. This allows a remote attacker to bypass Cross-Origin Resource Sharing (CORS) restrictions by crafting a malicious domain that partially matches a trusted one. Consequently, the attacker can make unauthorized cross-origin requests to the Jupyter Server API from an untrusted site, potentially leading to sensitive information disclosure or other unauthorized actions.

CWE

CWE-625

Affected Products

Migration Toolkit for Applications 8Red Hat OpenShift AI (RHOAI)

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 github.com 🔗 github.com