EUVD-2026-21237
GHSA-v5c9-pmxr-9vhc
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
5DescriptionCVE.org
A security vulnerability has been detected in Sanluan PublicCMS up to 6.202506.d. This affects the function AbstractFreemarkerView.doRender of the file publiccms-parent/publiccms-core/src/main/java/com/publiccms/common/base/AbstractFreemarkerView.java of the component FreeMarker Template Handler. Such manipulation leads to improper neutralization of special elements used in a template engine. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.
AnalysisAI
Improper neutralization of special elements in FreeMarker template processing within Sanluan PublicCMS up to version 6.202506.d allows high-privileged remote attackers to cause information disclosure through manipulation of the AbstractFreemarkerView.doRender function. The vulnerability has a CVSS score of 5.1 with publicly available exploit code, though exploitation requires administrative privileges (PR:H). CISA KEV status not confirmed; however, the disclosure of exploit code and vendor non-response indicate moderate real-world risk despite the high privilege requirement.
Technical ContextAI
The vulnerability exists in the FreeMarker template engine integration within PublicCMS, specifically in the AbstractFreemarkerView.doRender method responsible for rendering FreeMarker templates. FreeMarker is a Java-based template engine used to generate dynamic content by processing template directives. CWE-791 (Improper Filtering of Special Elements) indicates that special template language constructs or directives are not properly neutralized before processing, potentially allowing an attacker to inject malicious template code. The affected component handles template rendering at the framework level, making improper input validation in this area a critical security boundary. The vulnerability is rooted in inadequate sanitization of template content before FreeMarker processes it, allowing special elements to be interpreted as directives rather than literal content.
RemediationAI
Upgrade Sanluan PublicCMS to a patched version released after the disclosure of this vulnerability; however, a specific vendor-released patch version has not been independently confirmed from available data at time of analysis. Organizations should monitor the official PublicCMS GitHub repository (https://github.com/sanluan/PublicCMS/) for security updates and patch releases. In the interim, implement strict access controls limiting FreeMarker template administration to trusted personnel only, restrict file upload capabilities that could introduce malicious templates, and monitor template rendering logs for suspicious activity. Given the vendor's reported non-response, consider alternative CMS solutions or maintain heightened security monitoring until patches are officially released.
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Same weakness CWE-791 – Incomplete Filtering of Special Elements
View allSame technique Information Disclosure
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External POC / Exploit Code
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