baserCMS: Unauthenticated Stored XSS via Shortcode Expansion in Blog Comments

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-115457
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 14:17:51 UTC
Updated2026-10-23 14:17:51 UTC
DescriptionbaserCMS 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Baserproject Basercms affected >= 5.0.0, < 5.3.2 Not specified
CNA Baserproject Basercms affected >= 5.4.0, < 5.4.2 Not specified

References

ReferenceSourceLinkTags
github.com/baserproject/basercms/releases/tag/5.3.2 [email protected] github.com
github.com/baserproject/basercms/security/advisories/GHSA-qhv2-3j2q-v43x [email protected] github.com
github.com/baserproject/basercms/commit/bec4776ab497457fac76da7ae67d2dd0... [email protected] github.com
github.com/baserproject/basercms/releases/tag/5.4.2 [email protected] github.com
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