CVE-2026-39823: Bypass of meta content URL escaping causes XSS in html/template

Overview

Severity

Medium (CVSS 6.1)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploit Status

Not Exploited

Patch Tuesday

2026-May

Released

2026-05-10

Last Updated

2026-09-17

EPSS Score

0.31% (percentile: 24.6%)

Affected Products (3)

Other

• 21203-17084
• 21206-17084
• 21778-17084

Security Updates (1)

• Security Update

Revision History

• 2026-05-10: Information published.
• 2026-05-11: Information published.
• 2026-05-13: Information published.
• 2026-05-19: Information published.
• 2026-06-03: Information published.
• 2026-06-23: Information published.
• 2026-09-03: Information published.
• 2026-09-07: Information published.
• 2026-09-09: Information published.
• 2026-09-17: Information published.