CVE-2026-5987Public exploitNetwork attack vector

Admin-to-server command execution via exposed ApplicationContext

Published Apr 9, 2026 · Updated Apr 9, 2026

Server-side template injection in PublicCMS 4.0.202506.a through 6.202506.d allows remote authenticated users to execute server commands. AbstractFreemarkerView.doRender leaves the FreeMarker Application object unwrapped, exposing Spring's ApplicationContext so templates can relax class resolution and instantiate Execute. Administrative access to create or edit a template is required; successful exploitation runs commands with the CMS server process's privileges.

CVSS severityUnavailable
Unscored
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Server-side template injection in PublicCMS 4.0.202506.a through 6.202506.d allows remote authenticated users to execute server commands. AbstractFreemarkerView.doRender leaves the FreeMarker Application object unwrapped, exposing Spring's ApplicationContext so templates can relax class resolution and instantiate Execute. Administrative access to create or edit a template is required; successful exploitation runs commands with the CMS server process's privileges.

The record

CVE
CVE-2026-5987
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Tianjin Black Core Technology Co., LTD.
Product
PublicCMS
Classifications
CWE-791, CWE-1336, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0.202506.a
  2. Affected versionversion=4.0.202506.b
  3. Affected versionversion=5.202506.a
  4. Affected versionversion=5.202506.b
  5. Affected versionversion=5.202506.d
  6. Affected versionversion=6.202506.d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Tianjin Black Core Technology Co., LTD. · PublicCMSversion=4.0.202506.a; version=4.0.202506.b; version=5.202506.a; version=5.202506.b; version=5.202506.d; version=6.202506.d

Published CVSS scores

4.7VulDBCVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
4.7VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
5.8VulDBAV:N/AC:L/Au:M/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
5.1VulDBCVSS: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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-791Incomplete Filtering of Special Elements
CWE-1336Improper Neutralization of Special Elements Used in a Template Engine
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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