Code Injection Vulnerability in Sanluan PublicCMS Affected by Template Engine Manipulation
CVE-2026-5987

5.1MEDIUM

Key Information:

Vendor

Sanluan

Status
Publiccms
Vendor
CVE Published:
9 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5987?

A security vulnerability has been identified in Sanluan PublicCMS versions up to 6.202506.d, specifically within the AbstractFreemarkerView.doRender function in the FreeMarker Template Handler component. This flaw allows for improper handling of special elements in templates, which can expose the system to remote code injection attacks. The vulnerability has been publicly acknowledged, with no remediation measures communicated by the project maintainers. Users of affected versions are urged to assess their exposure and implement security best practices.

Affected Version(s)

PublicCMS 4.0.202506.a

PublicCMS 4.0.202506.b

PublicCMS 5.202506.a

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-5987 - Proof of Concept

References

https://vuldb.com/vuln/356541
vdb-entrytechnical-description
https://vuldb.com/vuln/356541/cti
signaturepermissions-required
https://vuldb.com/submit/792385
third-party-advisory

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

anch0r (VulDB User)
VulDB CNA Team
.