What is CVE-2026-91766?

CVE-2026-91766 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Cross-origin credential leak in HTTP stream wrapper redirects

Which CVE IDs does CVE-2026-91766 cover?

CVE-2026-91766 covers the following CVE IDs: CVE-2026-91766. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-91766?

CVE-2026-91766 has a CVSS v3 base score of 5.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-91766?

CVE-2026-91766 affects 1 product, including: azl3 php 8.3.33-1 on Azure Linux 3.0.

CVE-2026-91766MediumCVSS 5.9

Cross-origin credential leak in HTTP stream wrapper redirects

Vendor

Microsoft Security Response Center (MSRC)

Published

September 27, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-91766 →

🎯 Affected products1

azl3 php 8.3.33-1 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-91766
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade