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Medium severity · published Jun 29, 2026
CVE-2026-55956
Apache Tomcat: Security constraints for default servlet ignored method
6.5
CVSS
0.7%
EPSS
No
On KEV
Description
Improper Authorization vulnerability in Apache Tomcat leads to security constraints specified for the default servlet ignoring any method or method omission configured as part of the constraint. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from 9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TO
Tomcat · Apache
11.0.0-M1 through 11.0.22; 10.1.0-M1 through 10.1.55; 9.0.0.M1 through 9.0.118; 8.5.0 through 8.5.100; 7.0.0 through 7.0.109 · source: vendor, NVD
Affected product
TO
Tomcat
Apache
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55956
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55956
Vendor Advisory
https://lists.apache.org/thread/dcjdcnnnww9hhdm016hr0l7hpw1bzjfp
Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/06/29/25
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