CVE-2026-114622
HighCVSS 7.2Exploitation Probability (EPSS)
Low risk49th percentile - higher than 49% of all known CVEs
Summary
In the optional BcThemeFile plugin of baserCMS, the 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.
Risk Assessment
An administrator or an attacker with an administrator session can write and execute arbitrary PHP code on the server, leading to full application compromise. This requires the BcThemeFile plugin, an administrator session, and a same-origin Origin header.
Recommendation
Update baserCMS to version 5.3.2 or 5.4.2, which patch the vulnerability. If the BcThemeFile plugin is not needed, consider disabling or removing it, and restrict administrator privileges.
Other vulnerabilities in baserCMS
See all- CVE-2026-97150High
When converting baserCMS4-style addons to baserCMS5-style ones, BcAddonMigrator includes 'config.php' from the addon, which means the PHP code in the file is executed. Arbitrary files on the system may be read or deleted by an administrative user.
- CVE-2017-10844High
baserCMS versions 3.0.14 and earlier, 4.0.5 and earlier allow an attacker to execute arbitrary PHP code on the server via unspecified vectors.
- CVE-2017-10843High
baserCMS versions 3.0.14 and earlier, 4.0.5 and earlier allow remote attackers to delete arbitrary files via unspecified vectors when the 'File' field is being used in the mail form.
- CVE-2016-4882High
CSRF vulnerability in baserCMS version 3.0.10 and earlier allows remote attackers to hijack the authentication of administrators via unspecified vectors.
- CVE-2016-4878High
The CSRF vulnerability in baserCMS version 3.0.10 and earlier allows remote attackers to hijack the authentication of administrators via unspecified vectors.
- CVE-2016-4876High
Version 3.0.10 and earlier of baserCMS contains a cross-site request forgery (CSRF) vulnerability that allows remote attackers to hijack the authentication of administrators and execute arbitrary PHP code via unspecified vectors.
- CVE-2017-10842Critical
A SQL injection vulnerability in baserCMS versions 3.0.14 and earlier, 4.0.5 and earlier allows remote attackers to execute arbitrary SQL commands via unspecified vectors.
- CVE-2026-115481High
In baserCMS, PermissionGroupsService::build() reads a plugin's config/permission.php to determine user group permissions. When that file is absent, it writes a wildcard allow rule for every non-admin group. BcCustomContent has no such file in any release, so after an administrator installs it, the default operators group can store and execute arbitrary PHP under the document root.
- CVE-2026-115480Medium
In baserCMS versions 5.0.0 before 5.3.2 and 5.4.0 before 5.4.2, the public mail message API endpoint does not enforce the form's auth_captcha setting. An unauthenticated attacker can automate submissions without solving the captcha.
- CVE-2026-115479Medium
In baserCMS versions 5.2.5 before 5.3.2 and 5.4.0 before 5.4.2, an unauthenticated visitor can supply a comma-separated address list in a public mail form's email field, causing a single auto-reply to be addressed to multiple third parties.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS