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Apache Struts developers released fixes for CVE-2024-53677, a critical vulnerability in the framework's file upload handling that can allow malicious file upload and remote code execution in applications using FileUploadInterceptor. The flaw affects Struts versions 2.0.0 through 2.3.37, 2.5.0 through 2.5.33, and 6.0.0 through 6.3.0.2, and has been assigned a CVSS 4.0 score of 9.5. Public proof-of-concept exploit code is available, and CSIRT.SK reported that the vulnerability is being actively exploited in the wild.
Apache's guidance points organizations to Struts 6.4.0 or later, but the vendor's file upload documentation indicates remediation is not limited to patching alone: affected applications must also update source code to adopt the framework's newer file upload mechanism. Defenders are advised to review network and security logs for signs of compromise, as exposed internet-facing Struts applications that still rely on the legacy upload interceptor face elevated risk of exploitation.
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CSIRT.SK reported that CVE-2024-53677 was being actively exploited in the wild. The notice said the flaw could be abused for malicious file upload and remote code execution in applications using FileUploadInterceptor, and that public proof-of-concept exploit code was available.
Apache Struts developers released security updates to address CVE-2024-53677, a critical file upload vulnerability affecting multiple Struts version ranges. Apache recommended upgrading to Struts 6.4.0 or later and noted that remediation also requires application source code changes to use the new file upload mechanism.
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Attackers are actively scanning for and attempting to exploit critical Apache Struts file upload vulnerabilities `CVE-2024-53677` and `CVE-2023-50164`, both of which stem from improper handling of upload parameters that can enable path traversal and unauthorized file placement. Security researchers reported internet-wide enumeration and exploitation activity following public disclosure and the appearance of proof-of-concept code on GitHub and in technical write-ups, with attackers seeking to upload malicious files into restricted directories. Successful exploitation can allow deployment of JSP web shells and lead to remote code execution on vulnerable Struts applications, depending on how file upload features are exposed and sanitized in each environment. The flaws affect multiple Struts branches, including legacy 2.x and 6.x releases, and defenders have been urged to upgrade to fixed versions such as Struts `2.5.33`, `6.3.0.2`, or `6.4.0` as applicable, migrate away from legacy upload mechanisms, restrict access to upload interfaces, apply WAF protections, and monitor for suspicious JSP file creation and execution.
Aug 21, 2026
Apache Struts 2 contained a remote code execution flaw, **`CVE-2017-5638`**, in the Jakarta Multipart parser that allowed attackers to run arbitrary commands by sending crafted HTTP file-upload headers, including malicious `Content-Type`, `Content-Disposition`, or `Content-Length` values. The vulnerability affected Struts 2.3.x before 2.3.32 and 2.5.x before 2.5.10.1, and the CVE record notes that exploitation was observed in the wild, including attacks using a `Content-Type` header containing a `#cmd=` string. The Apache Software Foundation highlighted **`CVE-2017-5638`** as one of the notable exploitation-related cases in its annual security reporting, which summarized hundreds of vulnerability reports handled across more than 340 Apache projects. ASF said its 2020 security operations processed 18,000 security-related emails down to 946 non-spam threads, tracked 376 new vulnerability reports across 101 top-level projects, and assigned 151 CVE identifiers from 341 closed reports, underscoring both the scale of Apache’s disclosure workload and the continued significance of high-impact flaws such as the Struts RCE.
Aug 15, 2026
A high-severity vulnerability, tracked as CVE-2025-66675, has been identified in Apache Struts 2, affecting versions 2.0.0 through 6.7.4 and 7.0.0 through 7.0.3. The flaw arises from a file leak in the multipart request processing component, which can lead to disk exhaustion and result in a denial-of-service (DoS) condition. Attackers can exploit this vulnerability remotely, potentially causing affected servers to crash by exhausting disk resources. The issue has been addressed in versions 6.8.0 and 7.1.1, and users are strongly advised to upgrade to these fixed versions to mitigate the risk. The vulnerability is related to improper handling of file uploads in multipart requests, which can allow attackers to trigger uncontrolled file creation or retention, leading to resource exhaustion. Security advisories recommend prompt patching, as the flaw is remotely exploitable and could be leveraged in automated attacks targeting exposed Struts 2 instances. No evidence of exploitation in the wild has been reported as of the latest updates, but the critical nature of the flaw warrants immediate attention from organizations using vulnerable versions.
Jun 29, 2026