{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/spring-boot/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":9.1,"id":"CVE-2026-40976"},{"cvss":7,"id":"CVE-2026-40973"},{"cvss":7.5,"id":"CVE-2026-40972"}],"_cs_exploited":false,"_cs_products":["Spring Boot"],"_cs_severities":["critical"],"_cs_tags":["spring-boot","vulnerability","rce","authentication-bypass","session-hijacking"],"_cs_type":"advisory","_cs_vendors":["Spring"],"content_html":"\u003cp\u003eA set of critical vulnerabilities has been discovered in Spring Boot, a widely used Java framework for building web applications and backend services. These vulnerabilities, including CVE-2026-40976 (CVSS 9.1), CVE-2026-40973 (CVSS 7.0), and CVE-2026-40972 (CVSS 7.5), pose a significant threat to organizations using affected versions (specifically versions before 4.0.6, 3.5.14, 3.4.16, 3.3.19, and 2.7.33). Successful exploitation could lead to unauthorized access, session hijacking, and remote code execution, impacting the confidentiality, integrity, and availability of critical business systems. The initial advisory was released by CCB Belgium on April 28, 2026, urging immediate patching.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003eInitial Access (CVE-2026-40976 - Authentication Bypass):\u003c/strong\u003e An attacker sends a crafted HTTP request to a vulnerable Spring Boot application endpoint.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eExploit Default Configuration:\u003c/strong\u003e If the application is servlet-based, relies on the default Spring Security filter chain, depends on spring-boot-actuator-autoconfigure, and does not depend on spring-boot-health, the default web security configuration fails to enforce authorization.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eUnauthorized Access:\u003c/strong\u003e Due to the authorization bypass, the attacker gains unauthorized access to all application endpoints without proper authentication.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eSession Hijacking (CVE-2026-40973):\u003c/strong\u003e A local attacker exploits the vulnerability to take control of the ApplicationTemp directory.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eCode Execution (CVE-2026-40973):\u003c/strong\u003e Once in control of the ApplicationTemp directory, the attacker can potentially execute arbitrary code within the context of the application.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eTiming Attack (CVE-2026-40972):\u003c/strong\u003e An attacker on the same network conducts a timing attack against the DevTools remote secret.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eRemote Code Execution (CVE-2026-40972):\u003c/strong\u003e By successfully exploiting the timing attack, the attacker can potentially achieve remote code execution on the vulnerable server.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eImpact:\u003c/strong\u003e The attacker gains full control of the system, allowing for data exfiltration, system compromise, and operational downtime.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of these Spring Boot vulnerabilities can lead to significant damage, including unauthorized access to sensitive data, complete system compromise, and extended operational downtime. The potential number of victims is vast, considering the widespread use of Spring Boot in various sectors including finance, healthcare, and e-commerce. If an attacker successfully exploits these vulnerabilities, they could steal sensitive customer data, disrupt critical business operations, or deploy ransomware, resulting in significant financial losses and reputational damage.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eImmediately patch Spring Boot applications to the latest versions (\u0026gt;=4.0.6, \u0026gt;=3.5.14, \u0026gt;=3.4.16, \u0026gt;=3.3.19, \u0026gt;=2.7.33) to address CVE-2026-40976, CVE-2026-40973, and CVE-2026-40972.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect Suspicious Access to Actuator Endpoints\u0026rdquo; to identify potential exploitation attempts targeting CVE-2026-40976 by monitoring access to sensitive actuator endpoints.\u003c/li\u003e\n\u003cli\u003eUpscale monitoring and detection capabilities to identify any related suspicious activity as recommended by the CCB.\u003c/li\u003e\n\u003cli\u003eInvestigate and remediate any potentially compromised systems following the patching process.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-29T12:00:00Z","date_published":"2026-04-29T12:00:00Z","id":"/briefs/2026-04-spring-boot-vulns/","summary":"Multiple vulnerabilities in Spring Boot, including CVE-2026-40976, CVE-2026-40973, and CVE-2026-40972, can allow attackers to bypass authorization, hijack sessions, or achieve remote code execution, potentially leading to data breaches and system compromise.","title":"Multiple Vulnerabilities in Spring Boot Allow Authorization Bypass and Potential RCE","url":"https://feed.craftedsignal.io/briefs/2026-04-spring-boot-vulns/"},{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Tanzu Spring Boot"],"_cs_severities":["critical"],"_cs_tags":["vmware","spring-boot","vulnerability"],"_cs_type":"advisory","_cs_vendors":["VMware"],"content_html":"\u003cp\u003eMultiple vulnerabilities exist in VMware Tanzu Spring Boot that could be exploited by malicious actors. While the specific CVEs and technical details of these vulnerabilities are not disclosed, the potential impact is significant. An attacker could leverage these vulnerabilities to achieve arbitrary code execution, circumvent security controls, manipulate or disclose confidential data, and even hijack authenticated user sessions. Given the widespread use of Spring Boot in enterprise applications, these vulnerabilities pose a substantial risk to organizations utilizing this framework. Defenders should prioritize identifying and mitigating these vulnerabilities to prevent potential exploitation.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker identifies a vulnerable endpoint in a Tanzu Spring Boot application.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious request designed to exploit a vulnerability, such as a deserialization flaw or an SQL injection point.\u003c/li\u003e\n\u003cli\u003eThe malicious request bypasses input validation or authentication mechanisms due to the vulnerability.\u003c/li\u003e\n\u003cli\u003eThe exploited vulnerability allows the attacker to execute arbitrary code within the context of the Spring Boot application.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the code execution to gain access to sensitive data, such as database credentials or API keys.\u003c/li\u003e\n\u003cli\u003eThe attacker uses the compromised credentials to access other systems or resources within the network.\u003c/li\u003e\n\u003cli\u003eThe attacker escalates privileges within the Spring Boot application or the underlying operating system.\u003c/li\u003e\n\u003cli\u003eThe attacker establishes persistence and maintains long-term access to the compromised system, potentially leading to data exfiltration or further malicious activities.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of these vulnerabilities could lead to a wide range of damaging outcomes. Attackers could gain unauthorized access to sensitive data, disrupt critical business processes, or deploy ransomware. The lack of specific details regarding the number of victims and targeted sectors makes it difficult to quantify the precise impact, but the potential for widespread disruption is considerable, especially given the prevalence of Spring Boot applications. The ability to execute arbitrary code provides attackers with significant control over affected systems.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInvestigate Tanzu Spring Boot applications for unusual process execution using the rule \u0026ldquo;Detect Suspicious Spring Boot Process Execution\u0026rdquo;.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for suspicious requests that could be indicative of vulnerability exploitation with the rule \u0026ldquo;Detect Malicious Request to Spring Boot Application\u0026rdquo;.\u003c/li\u003e\n\u003cli\u003eImplement strict input validation and output encoding measures in Tanzu Spring Boot applications to prevent common web application vulnerabilities.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-28T08:31:28Z","date_published":"2026-04-28T08:31:28Z","id":"/briefs/2026-04-tanzu-spring-boot-vulns/","summary":"Multiple vulnerabilities in VMware Tanzu Spring Boot allow attackers to execute arbitrary code, bypass security measures, manipulate or disclose sensitive data, or hijack authenticated users.","title":"VMware Tanzu Spring Boot Multiple Vulnerabilities","url":"https://feed.craftedsignal.io/briefs/2026-04-tanzu-spring-boot-vulns/"}],"language":"en","title":"CraftedSignal Threat Feed — Spring-Boot","version":"https://jsonfeed.org/version/1.1"}