CVE-2026-55956

Apache Tomcat: Security constraints for default servlet ignored method

MEDIUM

6.5

CVSS Score

Published: June 29, 2026 at 08:46 PM UTC

Updated: October 25, 2026 at 09:10 PM UTC

1 product affected across 1 vendorTomcat

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Tomcat · Apache

95%

v < 9.0.11910.1.0 ≤ v < 10.1.5611.0.0 ≤ v < 11.0.2310.1.0-M1 11.0.0-M1 7.0.0 8.5.0 9.0.0.M1

Affected range stops below 10.1.56, so it looks safe — our inference, not a vendor statement

Affected range stops below 11.0.23, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.0.119, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 7.0.0 (unknown)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://lists.apache.org/thread/dcjdcnnnww9hhdm016hr0l7hpw1bzjfp

References (2)

Vendor AdvisoryMailing List

Source: cverecord

https://lists.apache.org/thread/dcjdcnnnww9hhdm016hr0l7hpw1bzjfp

Third Party Advisory

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.openwall.com/lists/oss-security/2026/06/29/25

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: LOW
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-285

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