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CVE-2026-114622— baserCMS: Encoded path traversal bypass in the theme file API

Quick assessment

Affected
baserproject basercms
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.

baserCMS 是一个网站开发框架。在 5.2.3 至 5.3.2 之前的版本，以及 5.4.0 至 5.4.2 之前的版本中，可选的 BcThemeFile 插件的 Admin API 在 和 方法中对原始路径进行了验证；然而， 方法随后在写入文件之前，会对 调用 进行解码。由于 仅能解析字面上的点号段（如 ），经过百分号编码的路径遍历攻击（例如 ）可以绕过包含性检查，并在写入目标处被解码为指向主题目录之外的路径。已认证的管理员因此能够将 PHP 文件写入可写位置（如 webroot），并执行这些文件，从而突破

CVSS 7.2 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
baserproject basercms >= 5.2.3, < 5.3.2 affected
>= 5.4.0, < 5.4.2 affected
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I. Basic Information for CVE-2026-114622

Vulnerability Information
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Vulnerability Title
baserCMS: Encoded path traversal bypass in the theme file API
Source: CVE Program / CVE List V5
Vulnerability Description
baserCMS is a website development framework. In versions 5.2.3 before 5.3.2 and 5.4.0 before 5.4.2, the optional BcThemeFile plugin's Admin API validates a raw path in ThemeFilesService::update() and getFullpath(), but ThemeFileForm::_execute() subsequently applies rawurldecode() to fullpath before writing. Because normalizePath() resolves only literal dot segments, percent-encoded traversal can pass the containment checks and become a path outside the theme directory at the write sink. An authenticated administrator can write PHP files into writable locations such as webroot and execute them, exceeding the intended theme-template editing boundary. The source also identifies the same check-before-decode ordering in ThemeFilesService::copy(), although that path was not dynamically verified. Exploitation requires the non-default plugin, an administrator session, and a same-origin Origin header; USE_CORE_ADMIN_API=false does not block session-authenticated requests. The Admin web form is not affected by this encoded-path tampering because FormProtection protects fullpath. This is a third bypass of the protections associated with CVE-2026-30940, using encoded traversal decoded after validation. This issue has been patched in versions 5.3.2 and 5.4.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
baserproject basercms >= 5.2.3, < 5.3.2 -

II. Public POCs for CVE-2026-114622

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III. Intelligence Information for CVE-2026-114622

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Vendor Advisories for CVE-2026-114622 (1)

Vendor Pages for CVE-2026-114622 (1)

Same Patch Batch · baserproject · 2026-10-23 · 8 CVEs total

CVE-2026-114621 8.8 HIGH baserCMS: SQL injection in the admin panel and admin API
CVE-2026-115481 8.5 HIGH baserCMS: BcCustomContent file fields can be configured to allow executable file extension
CVE-2026-114624 7.2 HIGH baserCMS: PHP object injection via unguarded unserialize() in the widget-area entity
CVE-2026-115457 7.1 HIGH baserCMS: Unauthenticated Stored XSS via Shortcode Expansion in Blog Comments
CVE-2026-114623 6.5 MEDIUM baserCMS: Path traversal in the BcThemeFile admin screen allows file disclosure
CVE-2026-115479 5.3 MEDIUM baserCMS: Mail-form auto-replies accept multiple visitor-controlled recipients
CVE-2026-115480 5.3 MEDIUM baserCMS: Public Web API mail-form submission bypasses image CAPTCHA

IV. Related Vulnerabilities

Same product: basercms
Same vendor: baserproject
Same weakness: CWE-22

V. Comments for CVE-2026-114622

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