CVE-2026-32734

High

Published: 31 March 2026

Published

31 March 2026

Modified

01 April 2026

KEV Added

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Patch

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CVSS Score 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

EPSS Score 0.0003 10.5th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-32734 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Basercms Basercms. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 10.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

Directly prevents DOM-based XSS exploitation by validating and sanitizing malicious inputs during tag creation in baserCMS.

SI-15 Information Output Filtering good match

prevent

Mitigates DOM-based XSS by filtering and encoding outputs before DOM manipulation in the browser.

SI-2 Flaw Remediation good match

prevent

Addresses the vulnerability through timely flaw remediation by patching baserCMS to version 5.2.3 or later.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1059.007 JavaScript Execution

Adversaries may abuse various implementations of JavaScript for execution.

attack.mitre.org →

Why these techniques?

DOM-based XSS in public-facing baserCMS directly enables remote exploitation of the web app (T1190) and arbitrary JavaScript execution in the victim browser via crafted tag input (T1059.007).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

baserCMS is a website development framework. Prior to version 5.2.3, baserCMS has DOM-based cross-site scripting in tag creation. This issue has been patched in version 5.2.3.

Deeper analysisAI

CVE-2026-32734 is a DOM-based cross-site scripting vulnerability (CWE-79) affecting baserCMS, a website development framework. The flaw exists in the tag creation functionality in versions prior to 5.2.3. Published on 2026-03-31, it carries a CVSS v3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L), indicating high severity due to network accessibility, low complexity, and changed scope despite requiring user interaction.

Unauthenticated attackers can exploit the vulnerability remotely by crafting malicious input that triggers DOM manipulation during tag creation, typically requiring a victim to interact with a malicious link or input. Exploitation enables limited impacts on confidentiality, integrity, and availability, such as potential session hijacking or minor data alteration, with the changed scope allowing effects beyond the initial user's context.

The vulnerability has been patched in baserCMS version 5.2.3. Mitigation involves upgrading to this version or later. Detailed advisories and release notes are provided at https://basercms.net/security/JVN_20837860, https://github.com/baserproject/basercms/releases/tag/5.2.3, and https://github.com/baserproject/basercms/security/advisories/GHSA-677c-xv24-crgx.