CVE-2026-103088
Quick assessment
Affected
jknack handlebars.java
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
在 Handlebars.java 4.5.5 之前的版本中存在目录遍历漏洞。具体而言，在 handlebars-springmvc 4.5.3 和 4.5.4 版本中，针对 CVE-2026-63490 的路径 containment（路径隔离）修复机制存在缺陷：系统在对模板位置进行校验时，将其视为原始百分比编码（percent-encoded）字符串；然而，实际打开模板文件时，却通过 URL 处理程序对路径进行了百分比解码。 在采用 模板前缀且视图名称源自用户请求的 Spring MVC 应用中，攻击者可利用形
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| jknack | handlebars.java | 4.5.3< 4.5.5 |
affected |
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I. Basic Information for CVE-2026-103088
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Handlebars.java before 4.5.5 allows directory traversal. In handlebars-springmvc 4.5.3 and 4.5.4, the path-containment fix for CVE-2026-63490 validates template locations as raw percent-encoded strings, whereas the template file is opened through a URL handler that percent-decodes the path. In a Spring MVC application with a file: template prefix and a request-derived view name, a percent-encoded traversal such as %2e%2e/ bypasses both the view-resolver check and the loader-side containment and reads files outside the configured template base directory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
路径遍历：’../filedir’
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| jknack | handlebars.java | 4.5.3 ~ 4.5.5 | - |
|
II. Public POCs for CVE-2026-103088
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-103088 (1)
Vendor Advisories for CVE-2026-103088 (1)
Vendor Pages for CVE-2026-103088 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2026-103088
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