CVE-2026-75973 Apache Tomcat - Authentication Bypass

Apache Tomcat 8.5.0 to 8.5.100, 9.0.0.M4 to 9.0.121, 10.1.0-M1 to 10.1.59, and 11.0.0-M1 to 11.0.25 contain an improper authentication vulnerability caused by shared realm usage with SimpleAuthConfigProvider across multiple web applications, letting attackers bypass authentication, exploit requires multiple web applications using the provider.

CVSS base score 7.3 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.24% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Published
23 September 2026
Updated
15 October 2026
Weakness
CWE-287

Vendor fix

Upgrade to versions 11.0.26, 10.1.60, or 9.0.122 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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