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CVE-2026-115457— baserCMS: Unauthenticated Stored XSS via Shortcode Expansion in Blog Comments

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 5.0.0 至 5.3.2 之前的版本，以及 5.4.0 至 5.4.2 之前的版本中，全局短代码（shortcode）扩展会在完整渲染后的页面上执行，其中包括由未认证访客提交的、经过 HTML 转义的博客评论。若评论中包含 短代码，攻击者可将其 参数设置为受控的脚本 URL；该 URL 随后会被以 形式输出，并在其他访客或管理员打开显示该评论的文章时，在目标网站的原域下执行 JavaScript 代码。由于短代码处理发生在 HTML 渲染之后，即使对评论中的原始 HTML

CVSS 7.1 · High

Possible ATT&CK Techniques 2 AI

T1055 · Process Injection T1193
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I. Basic Information for CVE-2026-115457

Vulnerability Information
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Vulnerability Title
baserCMS: Unauthenticated Stored XSS via Shortcode Expansion in Blog Comments
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
baserproject basercms >= 5.0.0, < 5.3.2 -

II. Public POCs for CVE-2026-115457

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III. Intelligence Information for CVE-2026-115457

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Other References for CVE-2026-115457 (4)

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-2026-114622 7.2 HIGH baserCMS: Encoded path traversal bypass in the theme file API
CVE-2026-114624 7.2 HIGH baserCMS: PHP object injection via unguarded unserialize() in the widget-area entity
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-79

V. Comments for CVE-2026-115457

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