{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/cpes/cpe2.3ahandlebars_projecthandlebars.java/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":["cpe:2.3:a:handlebars_project:handlebars.java:*:*:*:*:*:*:*:*"],"_cs_cves":[{"cvss":7.5,"id":"CVE-2026-63490"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["handlebars-springmvc (\u003c 4.5.3)"],"_cs_severities":["high"],"_cs_tags":["cve-2026-63490","arbitrary-file-read","spring-mvc","template-injection"],"_cs_type":"advisory","_cs_vendors":["Handlebars.java"],"content_html":"\u003cp\u003eHandlebars.java version 4.5.3 and earlier is vulnerable to an arbitrary file read vulnerability (CVE-2026-63490) within the \u003ccode\u003eSpringTemplateLoader\u003c/code\u003e component. The vulnerability arises because \u003ccode\u003eSpringTemplateLoader\u003c/code\u003e trusts Spring's \u003ccode\u003eResourceLoader\u003c/code\u003e to resolve view names without applying the path-containment checks implemented in other loaders. The security boundary protecting the system relies on an unconditional \u003ccode\u003e.hbs\u003c/code\u003e suffix appended by \u003ccode\u003eAbstractTemplateLoader\u003c/code\u003e.\u003c/p\u003e\n\u003cp\u003eAttackers can bypass this suffix check by appending a URL fragment (\u003ccode\u003e#\u003c/code\u003e) to a user-influenced view name. Spring and the JDK treat the content following the fragment as metadata and discard it during resource resolution, effectively stripping the \u003ccode\u003e.hbs\u003c/code\u003e extension. This allows an attacker to manipulate the view path to point to arbitrary files on the filesystem readable by the JVM process. Successful exploitation leads to unauthenticated access to sensitive system files, including configuration files, API keys, CI/CD secrets, and service account tokens. This is particularly critical in Spring MVC applications that resolve view names based on user input.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker identifies a Spring MVC controller endpoint that returns a view name derived from user input (e.g., via query parameter or path variable).\u003c/li\u003e\n\u003cli\u003eAttacker crafts a malicious view name request containing a protocol prefix (e.g., \u003ccode\u003efile:\u003c/code\u003e) and the target file path.\u003c/li\u003e\n\u003cli\u003eAttacker appends a \u003ccode\u003e#\u003c/code\u003e character to the end of the path (e.g., \u003ccode\u003efile:/etc/passwd#\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eHandlebarsViewResolver\u003c/code\u003e passes the attacker-influenced string to the \u003ccode\u003ehandlebars.compile()\u003c/code\u003e method.\u003c/li\u003e\n\u003cli\u003e\u003ccode\u003eSpringTemplateLoader\u003c/code\u003e processes the path, and \u003ccode\u003eAbstractTemplateLoader\u003c/code\u003e appends \u003ccode\u003e.hbs\u003c/code\u003e after the \u003ccode\u003e#\u003c/code\u003e fragment.\u003c/li\u003e\n\u003cli\u003eSpring's \u003ccode\u003eResourceLoader\u003c/code\u003e resolves the path, discarding the fragment part (\u003ccode\u003e#.hbs\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eThe application parses and renders the contents of the target file as a Handlebars template.\u003c/li\u003e\n\u003cli\u003eThe HTTP response body returns the contents of the sensitive file to the attacker.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation allows unauthenticated attackers to read sensitive files accessible to the application process UID. This includes, but is not limited to, \u003ccode\u003eapplication.yml\u003c/code\u003e files containing database credentials and secret keys, cloud environment credentials (AWS/GCP), Kubernetes service account tokens, private keys, and environment variables. These primitives enable full-system compromise, lateral movement within a network, or escalation of privileges in cloud-native environments.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cp\u003ePrioritize patching to version 4.5.3 or later of \u003ccode\u003ehandlebars-springmvc\u003c/code\u003e. For applications where immediate patching is not possible, implement input validation in the view resolver to reject view names containing prohibited characters.\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade the \u003ccode\u003ecom.github.jknack:handlebars-springmvc\u003c/code\u003e dependency to version 4.5.3 or higher to incorporate the fix for CVE-2026-63490.\u003c/li\u003e\n\u003cli\u003eImplement an input validation layer in \u003ccode\u003eHandlebarsViewResolver.configure\u003c/code\u003e to detect and reject view names containing \u003ccode\u003e:\u003c/code\u003e or \u003ccode\u003e#\u003c/code\u003e characters.\u003c/li\u003e\n\u003cli\u003eConduct a code audit of all Spring MVC controllers to identify and refactor patterns where user input influences view names or template paths.\u003c/li\u003e\n\u003cli\u003eRestrict file access for the JVM process to only necessary directories to minimize the impact of potential arbitrary file read primitives.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-09-03T00:03:54Z","date_published":"2026-09-03T00:03:54Z","id":"https://feed.craftedsignal.io/briefs/2026-09-handlebars-spring-lfi/","summary":"An unauthenticated arbitrary file read vulnerability (CVE-2026-63490) exists in handlebars-springmvc \u003c 4.5.3 due to insufficient validation of user-influenced view names, allowing attackers to bypass file suffix restrictions using URL fragments.","title":"Arbitrary File Read in Handlebars.java SpringTemplateLoader via URL Fragment Bypass","url":"https://feed.craftedsignal.io/briefs/2026-09-handlebars-spring-lfi/"}],"language":"en","title":"CraftedSignal Threat Feed - Cpe:2.3:a:handlebars_project:handlebars.java:*:*:*:*:*:*:*:*","version":"https://jsonfeed.org/version/1.1"}