Libsoup: cookie domain validation bypass via uppercase characters in libsoup — CVE-2025-4035

Summary

Advisory CVE-2025-4035. Libsoup: cookie domain validation bypass via uppercase characters in libsoup Vendor: Microsoft. Source: MSRC. Threat: medium. CVSS 4.3. See the official advisory for details.

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

Read the official source

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