CVE-2026-114624
HighCVSS 7.2Exploitation Probability (EPSS)
Low risk49th percentile - higher than 49% of all known CVEs
Summary
In baserCMS, the widget-area entity serializes widgets only when the submitted value is an array, allowing a string submitted through the admin JSON API to be stored unchanged. Entity reads, including front-end rendering and API responses, deserialize the stored value with unserialize() without an allowed_classes restriction, accepting both raw and base64-encoded serialized data. An administrator, or an attacker who obtains widget-write capability through a separate vulnerability such as chained XSS, can plant an object graph that subsequently triggers on unauthenticated page requests.
Risk Assessment
Arbitrary command execution as the web-server user is possible via deserialization gadget chains, leading to full server compromise. The malicious payload can execute repeatedly until the database row is repaired.
Recommendation
Update baserCMS to version 5.3.2 or 5.4.2, which patch the vulnerability. Restrict widget write access to trusted administrators and regularly review database content for suspicious serialized data.
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 5.0.0 before 5.3.2 and 5.4.0 before 5.4.2, the widget-area entity serializes widgets only when the submitted value is an array, allowing a string submitted through the admin JSON API to be stored unchanged. Entity reads, including front-end rendering and API responses, deserialize the stored value with unserialize() without an allowed_classes restriction, accepting both raw and base64-encoded serialized data. An administrator, or an attacker who obtains widget-write capability through a separate vulnerability such as chained XSS, can plant an object graph that subsequently triggers on unauthenticated page requests. Two demonstrated gadget chains in the default dependency set use composer/composer ProcessExecutor::startJob() with Process::fromShellCommandline(), or logiscape/mcp-sdk-php StdioTransport::connect() with StdioServerParameters, to reach proc_open() and execute commands as the web-server user. Deserialization bypasses constructor-based readonly safeguards, and the stored payload can execute repeatedly until the database row is repaired. Unauthenticated page access is a trigger after privileged payload storage, not an unauthenticated means of initially planting the payload. This issue has been patched in versions 5.3.2 and 5.4.2.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS