CVE-2026-55276: Apache Tomcat: Logged effective web.xml is incomplete

Analysis on rafaelpfister.ch

Article · October 31, 2026 totemomail 9.5.1: Account takeover in the Web Portal and SSRF via incoming email fixed totemomail 9.5.1 fixes eight security vulnerabilities and brings totemomail in line with the Kiteworks advisories for Email Protection Gateway published at the end of September. Two vulnerabilities can be exploited without authentication: a flaw in the Web Portal password reset process that allows administrator accounts to be taken over, and server-side retrieval of URLs from incoming messages. The release also includes path traversal fixes in the Admin API and Mail API, as well as updated Tomcat and Batik libraries.

Vendor 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.

Reference data

Vendor

Apache Software Foundation

Affected products

Apache Tomcat

CVSS 3.1

9.1 (CRITICAL)

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness type

CWE-670: Always-Incorrect Control Flow Implementation

Published

June 29, 2026

Official sources

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CVE-2026-55276 Apache Tomcat: Logged effective web.xml is incomplete

Analysis on rafaelpfister.ch

Vendor description

Reference data

Official sources

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