CVE-2026-33557 | Apache Kafka 4.1.0 JWT Token improper authentication

VDB-358046 · CVE-2026-33557 · GCVE-0-2026-33557 APACHE KAFKA 4.1.0 JWT TOKEN IMPROPER AUTHENTICATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.4 $0-$5k 2.99+ Summaryinfo A vulnerability labeled as critical has been found in Apache Kafka 4.1.0. The impacted element is an unknown function of the component JWT Token Handler. Such manipulation leads to improper authentication. This vulnerability is documented as CVE-2026-33557. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded. Detailsinfo A vulnerability was found in Apache Kafka 4.1.0. It has been rated as critical. Affected by this issue is an unknown part of the component JWT Token Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The advisory is available at lists.apache.org. This vulnerability is handled as CVE-2026-33557. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 04/17/2026). Upgrading to version 4.1.2 or 4.2.0 eliminates this vulnerability. Productinfo Vendor Apache Name Kafka Version 4.1.0 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: 5.6 VulDB Meta Temp Score: 5.4 VulDB Base Score: 5.6 VulDB Temp Score: 5.4 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: Kafka 4.1.2/4.2.0 Timelineinfo 04/17/2026 Advisory disclosed 04/17/2026 +0 days VulDB entry created 04/17/2026 +0 days VulDB entry last update Sourcesinfo Vendor: apache.org Advisory: lists.apache.org Status: Confirmed CVE: CVE-2026-33557 (🔒) GCVE (CVE): GCVE-0-2026-33557 GCVE (VulDB): GCVE-100-358046 Entryinfo Created: 04/17/2026 10:55 Changes: 04/17/2026 10:55 (52) Complete: 🔍 Cache ID: 99:29F:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸