https://feed.craftedsignal.io/tags/spring-boot/Trending threats, MITRE ATT&CK coverage, and detection metadata — refreshed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioWed, 29 Apr 2026 12:00:00 +0000https://feed.craftedsignal.io/briefs/2026-04-spring-boot-vulns/Wed, 29 Apr 2026 12:00:00 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-04-spring-boot-vulns/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.A 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.

Attack Chain

1. Initial Access (CVE-2026-40976 - Authentication Bypass): An attacker sends a crafted HTTP request to a vulnerable Spring Boot application endpoint.
2. Exploit Default Configuration: 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.
3. Unauthorized Access: Due to the authorization bypass, the attacker gains unauthorized access to all application endpoints without proper authentication.
4. Session Hijacking (CVE-2026-40973): A local attacker exploits the vulnerability to take control of the ApplicationTemp directory.
5. Code Execution (CVE-2026-40973): Once in control of the ApplicationTemp directory, the attacker can potentially execute arbitrary code within the context of the application.
6. Timing Attack (CVE-2026-40972): An attacker on the same network conducts a timing attack against the DevTools remote secret.
7. Remote Code Execution (CVE-2026-40972): By successfully exploiting the timing attack, the attacker can potentially achieve remote code execution on the vulnerable server.
8. Impact: The attacker gains full control of the system, allowing for data exfiltration, system compromise, and operational downtime.

Impact

Successful 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.

Recommendation

• Immediately patch Spring Boot applications to the latest versions (>=4.0.6, >=3.5.14, >=3.4.16, >=3.3.19, >=2.7.33) to address CVE-2026-40976, CVE-2026-40973, and CVE-2026-40972.
• Deploy the Sigma rule “Detect Suspicious Access to Actuator Endpoints” to identify potential exploitation attempts targeting CVE-2026-40976 by monitoring access to sensitive actuator endpoints.
• Upscale monitoring and detection capabilities to identify any related suspicious activity as recommended by the CCB.
• Investigate and remediate any potentially compromised systems following the patching process.

]]>criticaladvisoryspring-bootvulnerabilityrceauthentication-bypasssession-hijackinghttps://feed.craftedsignal.io/briefs/2026-04-tanzu-spring-boot-vulns/Tue, 28 Apr 2026 08:31:28 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-04-tanzu-spring-boot-vulns/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.Multiple 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.

Attack Chain

1. An attacker identifies a vulnerable endpoint in a Tanzu Spring Boot application.
2. The attacker crafts a malicious request designed to exploit a vulnerability, such as a deserialization flaw or an SQL injection point.
3. The malicious request bypasses input validation or authentication mechanisms due to the vulnerability.
4. The exploited vulnerability allows the attacker to execute arbitrary code within the context of the Spring Boot application.
5. The attacker leverages the code execution to gain access to sensitive data, such as database credentials or API keys.
6. The attacker uses the compromised credentials to access other systems or resources within the network.
7. The attacker escalates privileges within the Spring Boot application or the underlying operating system.
8. The attacker establishes persistence and maintains long-term access to the compromised system, potentially leading to data exfiltration or further malicious activities.

Impact

Successful 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.

Recommendation

• Investigate Tanzu Spring Boot applications for unusual process execution using the rule “Detect Suspicious Spring Boot Process Execution”.
• Monitor web server logs for suspicious requests that could be indicative of vulnerability exploitation with the rule “Detect Malicious Request to Spring Boot Application”.
• Implement strict input validation and output encoding measures in Tanzu Spring Boot applications to prevent common web application vulnerabilities.

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