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CVE-2026-55276

Apache Tomcat vulnerability

9.1 CRITICALEPSS 0.61%
  1. Published29 Jun 2026

Description

Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and empty authorisation constraints were not included when the effective web.xml was logged. 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. 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 fixes the issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Apache Tomcat≥ 10.1.0 < 10.1.56 · ≥ 11.0.0 < 11.0.23 · < 9.0.119

Remediation

Fixed in
Apache Tomcat≥ 10.1.56

References

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Frequently asked

Is CVE-2026-55276 being actively exploited?

CVE-2026-55276 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.61%.

How severe is CVE-2026-55276?

CVE-2026-55276 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.61% probability of exploitation.

Which products are affected by CVE-2026-55276?

Affected products include Apache Tomcat.

How do I fix CVE-2026-55276?

Upgrade affected software to a fixed version, for example Apache Tomcat 10.1.56 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-55276 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.