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CVE-2018-1305 is an improper access-control vulnerability in Apache Tomcat. Security constraints declared through Servlet annotations were applied only after the associated Servlet was loaded. Since such constraints apply to their URL pattern and subordinate URLs, a particular Servlet loading order could leave constraints unenforced and protected resources accessible without the intended authorization checks. Affected versions are Tomcat 9.0.0.M1 through 9.0.4, 8.5.0 through 8.5.27, 8.0.0.RC1 through 8.0.49, and 7.0.0 through 7.0.84.
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What an attacker gets, and what they’ve been doing with it.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a proof-of-concept (PoC) for CVE-2018-1305, a security constraint bypass vulnerability in Apache Tomcat. The structure includes a Java web application with two servlets: Servlet1 (protected by a ServletSecurity annotation) and Servlet2 (unprotected), mapped to nested URL patterns via web.xml. The index.jsp provides links to both endpoints. The README.md explains the vulnerability, affected Tomcat versions, and step-by-step instructions to reproduce the issue. The exploit demonstrates that, due to Tomcat's servlet loading order, accessing the unprotected /servlet1/servlet2/ endpoint before the protected /servlet1/ allows unauthorized access, bypassing the intended security constraints. The repository is intended for demonstration and educational purposes, showing how improper application of security annotations can lead to privilege escalation in web applications.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An Apache Tomcat flaw where late application of security constraints can expose resources to unauthorized users.
An Apache Tomcat flaw in which security constraints are applied too late, potentially exposing resources to unauthorized users.
An Apache Tomcat flaw where delayed application of security constraints can expose resources to unauthorized users.
An Apache Tomcat flaw in which security constraints are applied too late, potentially exposing resources to unauthorized users, fixed in the Red Hat JBoss Web Server 3.1 Service Pack 2 update.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.