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TI-2026-39931 Aliases CVE-2026-55276GHSA-mqg3-r7h5-24x4

Apache Tomcat: Logged effective web.xml is incomplete

Priority MEDIUM 48CWE-670Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · None
Fix status
Partial Red Hat: 18 fixed, 6 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA, GitHub and Red Hat.

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 fixes the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00607 49th percentileScored 2026-11-07
Fix Partial org.apache.tomcat.embed:tomcat-embed-core (Maven): 11.0.23, 10.1.56, 9.0.119org.apache.tomcat:tomcat (Maven): 11.0.23, 10.1.56, 9.0.119+1 more productRed Hat: 14 advisoriesRed Hat: 18 fixed, 6 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache Tomcat11.0.0-M1 – 11.0.22; 10.1.0-M1 – 10.1.55; 9.0.0.M1 – 9.0.118; 8.5.0 – 8.5.100—Patch availableCNA
—org.apache.tomcat.embed:tomcat-embed-core (Maven)11.0.0-M1 to before 11.0.2311.0.23Patch availableGHSA-mqg3-r7h5-24x4
—org.apache.tomcat.embed:tomcat-embed-core (Maven)10.1.0-M1 to before 10.1.5610.1.56Patch availableGHSA-mqg3-r7h5-24x4
—org.apache.tomcat.embed:tomcat-embed-core (Maven)9.0.0.M1 to before 9.0.1199.0.119Patch availableGHSA-mqg3-r7h5-24x4
—org.apache.tomcat.embed:tomcat-embed-core (Maven)8.5.0 – 8.5.100—No fix listedGHSA-mqg3-r7h5-24x4
—org.apache.tomcat:tomcat (Maven)11.0.0-M1 to before 11.0.2311.0.23Patch availableGHSA-mqg3-r7h5-24x4
—org.apache.tomcat:tomcat (Maven)10.1.0-M1 to before 10.1.5610.1.56Patch availableGHSA-mqg3-r7h5-24x4
—org.apache.tomcat:tomcat (Maven)9.0.0.M1 to before 9.0.1199.0.119Patch availableGHSA-mqg3-r7h5-24x4
—org.apache.tomcat:tomcat (Maven)8.5.0 – 8.5.100—No fix listedGHSA-mqg3-r7h5-24x4
—org.apache.tomcat:tomcat-util-scan (Maven)11.0.0-M1 to before 11.0.2311.0.23Patch availableGHSA-mqg3-r7h5-24x4
—org.apache.tomcat:tomcat-util-scan (Maven)10.1.0-M1 to before 10.1.5610.1.56Patch availableGHSA-mqg3-r7h5-24x4
—org.apache.tomcat:tomcat-util-scan (Maven)9.0.0.M1 to before 9.0.1199.0.119Patch availableGHSA-mqg3-r7h5-24x4
—org.apache.tomcat:tomcat-util-scan (Maven)8.5.0 – 8.5.100—No fix listedGHSA-mqg3-r7h5-24x4
  • Apache Tomcat VendorApache Affected 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 Fixed in — Patch available CNA
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.23 Fixed in 11.0.23 Patch available GHSA-mqg3-r7h5-24x4
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.56 Fixed in 10.1.56 Patch available GHSA-mqg3-r7h5-24x4
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 9.0.0.M1 to before 9.0.119 Fixed in 9.0.119 Patch available GHSA-mqg3-r7h5-24x4
  • org.apache.tomcat.embed:tomcat-embed-core (Maven) Vendor— Affected 8.5.0 – 8.5.100 Fixed in — No fix listed GHSA-mqg3-r7h5-24x4
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.23 Fixed in 11.0.23 Patch available GHSA-mqg3-r7h5-24x4
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.56 Fixed in 10.1.56 Patch available GHSA-mqg3-r7h5-24x4
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 9.0.0.M1 to before 9.0.119 Fixed in 9.0.119 Patch available GHSA-mqg3-r7h5-24x4
  • org.apache.tomcat:tomcat (Maven) Vendor— Affected 8.5.0 – 8.5.100 Fixed in — No fix listed GHSA-mqg3-r7h5-24x4
  • org.apache.tomcat:tomcat-util-scan (Maven) Vendor— Affected 11.0.0-M1 to before 11.0.23 Fixed in 11.0.23 Patch available GHSA-mqg3-r7h5-24x4
  • org.apache.tomcat:tomcat-util-scan (Maven) Vendor— Affected 10.1.0-M1 to before 10.1.56 Fixed in 10.1.56 Patch available GHSA-mqg3-r7h5-24x4
  • org.apache.tomcat:tomcat-util-scan (Maven) Vendor— Affected 9.0.0.M1 to before 9.0.119 Fixed in 9.0.119 Patch available GHSA-mqg3-r7h5-24x4
  • org.apache.tomcat:tomcat-util-scan (Maven) Vendor— Affected 8.5.0 – 8.5.100 Fixed in — No fix listed GHSA-mqg3-r7h5-24x4

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*before 9.0.119; 10.1.0 to before 10.1.56; 11.0.0 to before 11.0.23VulnerableApache
  • cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:* Versions before 9.0.119; 10.1.0 to before 10.1.56; 11.0.0 to before 11.0.23 Vulnerable ·Apache

Remediation

  • Fix · GHSA-mqg3-r7h5-24x4 org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 11.0.23 Advisory →
  • Fix · GHSA-mqg3-r7h5-24x4 org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 10.1.56 Advisory →
  • Fix · GHSA-mqg3-r7h5-24x4 org.apache.tomcat.embed:tomcat-embed-core (Maven) Fixed in 9.0.119 Advisory →
  • Fix · GHSA-mqg3-r7h5-24x4 org.apache.tomcat:tomcat (Maven) Fixed in 11.0.23 Advisory →
  • Fix · GHSA-mqg3-r7h5-24x4 org.apache.tomcat:tomcat (Maven) Fixed in 10.1.56 Advisory →
  • Fix · GHSA-mqg3-r7h5-24x4 org.apache.tomcat:tomcat (Maven) Fixed in 9.0.119 Advisory →
  • Fix · GHSA-mqg3-r7h5-24x4 org.apache.tomcat:tomcat-util-scan (Maven) Fixed in 11.0.23 Advisory →
  • Fix · GHSA-mqg3-r7h5-24x4 org.apache.tomcat:tomcat-util-scan (Maven) Fixed in 10.1.56 Advisory →
  • Fix · GHSA-mqg3-r7h5-24x4 org.apache.tomcat:tomcat-util-scan (Maven) Fixed in 9.0.119 Advisory →

Red Hat 14 advisories

  • RHSA-2026:73981 Released 2026-10-01 · Red Hat rating Important
    Red Hat JBoss Web Server 6.2.5 release and security update
    • Red Hat JBoss Web Server 6.2 on RHEL 10 jws6-tomcat-10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-admin-webapps-10.1.49-16.redhat_00016.1.el10jws, jws6-tomcat-docs-webapp-10.1.49-16.redhat_00016.1.el10jws +7
    • Red Hat JBoss Web Server 6.2 on RHEL 8 jws6-tomcat-10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-admin-webapps-10.1.49-16.redhat_00016.1.el8jws, jws6-tomcat-docs-webapp-10.1.49-16.redhat_00016.1.el8jws +7
    • Red Hat JBoss Web Server 6.2 on RHEL 9 jws6-tomcat-10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-admin-webapps-10.1.49-16.redhat_00016.1.el9jws, jws6-tomcat-docs-webapp-10.1.49-16.redhat_00016.1.el9jws +7
  • RHSA-2026:73982 Released 2026-10-01 · Red Hat rating Important
    Red Hat JBoss Web Server 6.2.5 release and security update
    • Red Hat JBoss Web Server 6.2.5
  • RHSA-2026:68651 Released 2026-09-18 · Red Hat rating Moderate
    tomcat9 security update
    • Red Hat Enterprise Linux AppStream (v. 10) tomcat9-1:9.0.120-1.el10_2, tomcat9-admin-webapps-1:9.0.120-1.el10_2, tomcat9-docs-webapp-1:9.0.120-1.el10_2 +5
Show 11 more Red Hat advisories
  • RHSA-2026:68677 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream (v. 8) tomcat-1:9.0.120-1.el8_10, tomcat-admin-webapps-1:9.0.120-1.el8_10, tomcat-docs-webapp-1:9.0.120-1.el8_10 +5
  • RHSA-2026:68660 Released 2026-09-17 · Red Hat rating Moderate
    tomcat security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) tomcat-1:9.0.120-2.el9_8, tomcat-admin-webapps-1:9.0.120-2.el9_8, tomcat-docs-webapp-1:9.0.120-2.el9_8 +5
  • RHSA-2026:68659 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) tomcat-1:9.0.120-1.el9_6, tomcat-admin-webapps-1:9.0.120-1.el9_6, tomcat-docs-webapp-1:9.0.120-1.el9_6 +5
  • RHSA-2026:68678 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) tomcat-1:9.0.120-1.el9_2, tomcat-admin-webapps-1:9.0.120-1.el9_2, tomcat-docs-webapp-1:9.0.120-1.el9_2 +5
  • RHSA-2026:68679 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) tomcat-1:9.0.120-1.el9_4, tomcat-admin-webapps-1:9.0.120-1.el9_4, tomcat-docs-webapp-1:9.0.120-1.el9_4 +5
  • RHSA-2026:68680 Released 2026-09-17 · Red Hat rating Important
    tomcat security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) tomcat-1:9.0.120-1.el8_8, tomcat-admin-webapps-1:9.0.120-1.el8_8, tomcat-docs-webapp-1:9.0.120-1.el8_8 +5
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) tomcat-1:9.0.120-1.el8_8, tomcat-admin-webapps-1:9.0.120-1.el8_8, tomcat-docs-webapp-1:9.0.120-1.el8_8 +5
  • RHSA-2026:67163 Released 2026-09-14 · Red Hat rating Important
    tomcat9 security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) tomcat9-1:9.0.120-1.el10_0, tomcat9-admin-webapps-1:9.0.120-1.el10_0, tomcat9-docs-webapp-1:9.0.120-1.el10_0 +5
  • RHSA-2026:49951 Released 2026-08-05 · Red Hat rating Moderate
    Red Hat JBoss Web Server 7.0.1 release and security update
    • Red Hat JBoss Web Server 7.0 on RHEL 10 jws7-tomcat-11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-admin-webapps-11.0.21-6.redhat_00005.1.el10jws, jws7-tomcat-docs-webapp-11.0.21-6.redhat_00005.1.el10jws +7
    • Red Hat JBoss Web Server 7.0 on RHEL 8 jws7-tomcat-11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-admin-webapps-11.0.21-6.redhat_00005.1.el8jws, jws7-tomcat-docs-webapp-11.0.21-6.redhat_00005.1.el8jws +7
    • Red Hat JBoss Web Server 7.0 on RHEL 9 jws7-tomcat-11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-admin-webapps-11.0.21-6.redhat_00005.1.el9jws, jws7-tomcat-docs-webapp-11.0.21-6.redhat_00005.1.el9jws +7
  • RHSA-2026:49952 Released 2026-08-05 · Red Hat rating Moderate
    Red Hat JBoss Web Server 7.0.1 release and security update
    • Red Hat JBoss Web Server 7.0.1
  • RHSA-2026:32960 Released 2026-06-29 · Red Hat rating Critical
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images tomcat11-1:11.0.23-0.1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat11-1:11.0.23-0.1.hum1@noarch@public-hummingbird-x86_64-rpms, tomcat11-1:11.0.23-0.1.hum1@src +18
  • RHSA-2026:29203 Released 2026-06-24 · Red Hat rating Critical
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images tomcat10-1:10.1.56-1.hum1@noarch@public-hummingbird-aarch64-rpms, tomcat10-1:10.1.56-1.hum1@noarch@public-hummingbird-x86_64-rpms, tomcat10-1:10.1.56-1.hum1@src +18

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Apache Tomcat 8.0.0

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-38490 Apache Tomcat: Bad ornext processing in RewriteValvePriority LOW 39
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat JBoss Web Server 5AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:68651
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:68677
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:68660
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:68680
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:68678
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:68679
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:67163
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:68659
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:68680
Red Hat Hardened ImagesFixed RHSA-2026:29203, RHSA-2026:32960
Red Hat JBoss Web Server 6.2 on RHEL 10Fixed RHSA-2026:73981
Red Hat JBoss Web Server 6.2 on RHEL 8Fixed RHSA-2026:73981
Red Hat JBoss Web Server 6.2 on RHEL 9Fixed RHSA-2026:73981
Red Hat JBoss Web Server 6.2.5Fixed RHSA-2026:73982
Red Hat JBoss Web Server 7.0 on RHEL 10Fixed RHSA-2026:49951
Red Hat JBoss Web Server 7.0 on RHEL 8Fixed RHSA-2026:49951
Red Hat JBoss Web Server 7.0 on RHEL 9Fixed RHSA-2026:49951
Red Hat JBoss Web Server 7.0.1Fixed RHSA-2026:49952

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55276
  2. 2026-10-03 Alias added: GHSA-mqg3-r7h5-24x4
  3. 2026-10-09 Fix available: RHSA-2026:49952 · Red Hat
  4. 2026-10-16 Fix available: Red Hat JBoss Web Server 7.0.1 · Red Hat
  5. 2026-11-04 Fix available: Maven/org.apache.tomcat.embed:[email protected], Maven/org.apache.tomcat.embed:[email protected], Maven/org.apache.tomcat.embed:[email protected] +6 · GHSA-mqg3-r7h5-24x4
  6. 2026-11-04 CVSS score added · GHSA-mqg3-r7h5-24x4
  7. 2026-11-04 Weakness changed · GHSA-mqg3-r7h5-24x4
  8. 2026-11-04 10 new references · GHSA-mqg3-r7h5-24x4

References

Advisory 3

Other 7

  • TI-2025-18529 Apache Tomcat: Potential RCE and/or information disclosure and/or information corruption with partial PUT KEVCVSS 3.1CRITICAL 10.0
  • TI-2020-01862 Improper privilege management in Apache Tomcat KEVCVSS 3.1CRITICAL 9.8
  • TI-2016-07192 Improper access control in Apache Tomcat KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-09342 Unrestricted file upload in Apache Tomcat KEVCVSS 3.1HIGH 8.1
  • TI-2017-09340 Unrestricted file upload in Apache Tomcat KEVCVSS 3.1HIGH 8.1
  • TI-2026-26741 Apache Tomcat: Fix for CVE-2026-29146 allowed bypass of EncryptInterceptor KEVCVSS 3.1HIGH 7.5
See all 273 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences