CVE-2026-115457 Details
Description
baserCMS is a website development framework. In versions 5.0.0 before 5.3.2 and 5.4.0 before 5.4.2, global shortcode expansion runs over the complete rendered page, including HTML-escaped blog comments supplied by unauthenticated visitors. A comment containing the BcBaser.getGoogleMaps shortcode can set apiBaseUrl to an attacker-controlled script URL, which is emitted as a script src and executes JavaScript on the site's origin when another visitor or administrator opens the article displaying that comment. Escaping raw HTML in comments does not prevent this stored cross-site scripting because shortcode processing happens after HTML rendering. Other registered shortcodes also expand in comments; Mail.getForm can embed a working contact form with a valid CSRF token. The flaw can compromise the authenticated browser context of an administrator who views the affected article. This issue has been patched in versions 5.3.2 and 5.4.2.
A stored cross-site scripting vulnerability has been identified in baserCMS, a website development framework, specifically in versions 5.0.0 prior to 5.3.2 and 5.4.0 prior to 5.4.2. The issue arises from the global expansion of shortcodes, which is applied to the entire rendered page, including HTML-escaped blog comments from unauthenticated visitors. By including a comment with the 'BcBaser.getGoogleMaps' shortcode, an attacker can inject a script URL that is executed as JavaScript on the site's origin when the comment is viewed by another visitor or an administrator. This vulnerability exploits the timing of shortcode processing, which occurs after HTML rendering, allowing for the execution of arbitrary scripts in the context of the user's browser.
Users can update to baserCMS versions 5.3.2 or 5.4.2 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 23, 2026CISA-ADP
Assessed Oct 29, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/baserproject/basercms/security/advisories/GHSA-qhv2-3j2q-v43x | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/baserproject/basercms/commit/bec4776ab497457fac76da7ae67d2dd0ad964eec | [email protected] | Source CodeVendor |
| https://github.com/baserproject/basercms/releases/tag/5.3.2 | [email protected] | Release NotesVendor |
| https://github.com/baserproject/basercms/releases/tag/5.4.2 | [email protected] | Release NotesVendor |
| https://github.com/baserproject/basercms/security/advisories/GHSA-qhv2-3j2q-v43x | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| baserCMS | >= 5.0.0, <= 5.4.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 29, 2026 | CVE Modified | CISA-ADP |
| Oct 23, 2026 | New CVE Received | [email protected] |