CVE-2026-34500 | Apache Tomcat up to 9.0.116/10.1.53/11.0.20 CLIENT_CERT Authentication improper authentication

VDB-356679 · CVE-2026-34500 · GCVE-0-2026-34500 APACHE TOMCAT UP TO 9.0.116/10.1.53/11.0.20 CLIENT_CERT AUTHENTICATION IMPROPER AUTHENTICATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.0 $0-$5k 2.00 Summaryinfo A vulnerability, which was classified as critical, has been found in Apache Tomcat up to 9.0.116/10.1.53/11.0.20. This issue affects some unknown processing of the component CLIENT_CERT Authentication. Performing a manipulation results in improper authentication. This vulnerability is cataloged as CVE-2026-34500. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component. Detailsinfo A vulnerability classified as critical has been found in Apache Tomcat up to 9.0.116/10.1.53/11.0.20. This affects an unknown functionality of the component CLIENT_CERT Authentication. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is: CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled and FFM is used in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M14 through 11.0.20, from 10.1.22 through 10.1.53, from 9.0.92 through 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fixes the issue. The weakness was shared by Haruki Oyama. It is possible to read the advisory at lists.apache.org. This vulnerability is uniquely identified as CVE-2026-34500 since 03/30/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/09/2026). Upgrading to version 9.0.117, 10.1.54 or 11.0.21 eliminates this vulnerability. Productinfo Type Application Server Software Vendor Apache Name Tomcat Version 9.0.116 10.1.0 10.1.1 10.1.2 10.1.3 10.1.4 10.1.5 10.1.6 10.1.7 10.1.8 10.1.9 10.1.10 10.1.11 10.1.12 10.1.13 10.1.14 10.1.15 10.1.16 10.1.17 10.1.18 10.1.19 10.1.20 10.1.21 10.1.22 10.1.23 10.1.24 10.1.25 10.1.26 10.1.27 10.1.28 10.1.29 10.1.30 10.1.31 10.1.32 10.1.33 10.1.34 10.1.35 10.1.36 10.1.37 10.1.38 10.1.39 10.1.40 10.1.41 10.1.42 10.1.43 10.1.44 10.1.45 10.1.46 10.1.47 10.1.48 10.1.49 10.1.50 10.1.51 10.1.52 10.1.53 11.0.0 11.0.1 11.0.2 11.0.3 11.0.4 11.0.5 11.0.6 11.0.7 11.0.8 11.0.9 11.0.10 11.0.11 11.0.12 11.0.13 11.0.14 11.0.15 11.0.16 11.0.17 11.0.18 11.0.19 11.0.20 License open-source Website Vendor: https://www.apache.org/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.3 VulDB Meta Temp Score: 7.0 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Improper authentication CWE: CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: Tomcat 9.0.117/10.1.54/11.0.21 Timelineinfo 03/30/2026 CVE reserved 04/09/2026 +10 days Advisory disclosed 04/09/2026 +0 days VulDB entry created 04/09/2026 +0 days VulDB entry last update Sourcesinfo Vendor: apache.org Advisory: lists.apache.org Researcher: Haruki Oyama Status: Confirmed CVE: CVE-2026-34500 (🔒) GCVE (CVE): GCVE-0-2026-34500 GCVE (VulDB): GCVE-100-356679 Entryinfo Created: 04/09/2026 22:12 Changes: 04/09/2026 22:12 (57) Complete: 🔍 Cache ID: 99:029:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸