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CVE-2026-55276

⛔ critical
🔍 Scan for this CVE
Summary

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

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 Score
9.1
Critical
EPSS Score
0.4
Exploit Probability
Published Date
2026-06-29
First Seen: 2026-06-30
📊 Relative Risk Intelligence

This CVE is High Risk - more severe than 87.6% of all 344,912 vulnerabilities in our database.

#42,747
Top 25% most severe
Severity Percentile
🎯 CISA SSVC Assessment Updated: Jun 30, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
YES
Can be exploited automatically
💥 Technical Impact
Total
Complete system compromise possible
SSVC data provided by CISA
Last Modified 2026-07-02
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE IDs (Weakness Types)
CWE-670

📦 Affected Products 3

Vendor Product Status Affected Versions
apache tomcat Affected
> 10.1.0 < 10.1.56
apache tomcat Affected
> 11.0.0 < 11.0.23
apache tomcat Affected
< 9.0.119

🔗 References 2

https://lists.apache.org/thread/jy09xjlzn6r2qwvqoph8...
Vendor Advisory Mailing List
http://www.openwall.com/lists/oss-security/2026/06/2...
Third Party Advisory

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-66299 ⚠️ high 7.5 0.5 Uncontrolled Resource Consumption vulnerability in Apache Tomcat's WebSocket chat example. This issue affects Apache To... 2026-07-28
CVE-2026-59083 ⛔ critical 9.1 0.4 Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constra... 2026-07-14
CVE-2026-59084 ⛔ critical 9.1 0.4 Insufficient Technical Documentation vulnerability in Apache Tomcat since the requirements to securely configure the Enc... 2026-07-14
CVE-2026-50229 🔶 medium 6.1 0.4 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in the number guess example ... 2026-06-29
CVE-2026-53404 ⚠️ high 7.3 0.4 Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat's rewrite valve meant that if the first cond... 2026-06-29
CVE-2026-53434 ⛔ critical 9.1 0.4 Detection of Error Condition Without Action vulnerability in Apache Tomcat when configuring CRLs for a FFM based connect... 2026-06-29
These CVEs affect the same products