Medium severity6.5NVD Advisory· Published Jun 29, 2026· Updated Jul 2, 2026
CVE-2026-55956
CVE-2026-55956
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 products
10>=11.0.0-M1,<=11.0.22, >=10.1.0-M1,<=10.1.55, >=9.0.0.M1,<=9.0.118, >=8.5.0,<=8.5.100, >=7.0.0,<=7.0.109+ 2 more
- (no CPE)range: >=11.0.0-M1,<=11.0.22, >=10.1.0-M1,<=10.1.55, >=9.0.0.M1,<=9.0.118, >=8.5.0,<=8.5.100, >=7.0.0,<=7.0.109
- cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*range: <9.0.119
- (no CPE)range: 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
- osv-coords7 versionspkg:bitnami/tomcatpkg:rpm/opensuse/tomcat&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/tomcat&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/tomcat10&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/tomcat10&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/tomcat11&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/tomcat11&distro=openSUSE%20Tumbleweed
< 9.0.119+ 6 more
- (no CPE)range: < 9.0.119
- (no CPE)range: < 9.0.119-160000.1.1
- (no CPE)range: < 9.0.119-1.1
- (no CPE)range: < 10.1.56-160000.1.1
- (no CPE)range: < 10.1.56-1.1
- (no CPE)range: < 11.0.23-160000.1.1
- (no CPE)range: < 11.0.23-1.1
Patches
Vulnerability mechanics
References
2- www.openwall.com/lists/oss-security/2026/06/29/25nvdThird Party Advisory
- lists.apache.org/thread/dcjdcnnnww9hhdm016hr0l7hpw1bzjfpnvdVendor AdvisoryMailing List
News mentions
4- ⚡ Weekly Recap: Proxy Botnets, Browser Ransomware, AI Agent Tricks, Fake PoC Malware and MoreThe Hacker News · Jul 6, 2026
- Cyber Security News Bulletin Weekly – Mythos is Back, WhatsApp Username, Kali Linux 2026.2, +20 StoriesCyber Security News · Jul 5, 2026
- Apache Software Foundation: 21 Vulnerabilities Across Multiple Products Disclosed in Early July 2026Vypr Intelligence · Jul 3, 2026
- Multiple Apache Tomcat Vulnerabilities Allow Attackers to Bypass AuthenticationCyber Security News · Jul 1, 2026