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CVE-2026-73679— ImpressCMS Authenticated RCE via PHP Custom Tag eval()

Quick assessment

Affected
ImpressCMS ImpressCMS
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ImpressCMS是ImpressCMS组织开源的一款网站内容管理平台。 ImpressCMS 2.0.3及之前版本存在代码注入漏洞，该漏洞源于自定义标签模块通过undoHtmlSpecialChars()解码HTML编码内容后未经HTML Purifier清理即传递给renderWithPhp()方法中的eval()函数，可能导致已认证管理员执行任意PHP代码。

CVSS 7.2 · High EPSS 1.13% · P66

Affected Version Matrix 1

VendorProduct Version RangeStatus
ImpressCMS ImpressCMS ≤ 2.0.3 affected
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I. Basic Information for CVE-2026-73679

Vulnerability Information
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Vulnerability Title
ImpressCMS Authenticated RCE via PHP Custom Tag eval()
Source: CVE Program / CVE List V5
Vulnerability Description
ImpressCMS contains an authenticated remote code execution vulnerability in the custom tag module that allows authenticated administrators to execute arbitrary PHP code by storing a malicious payload in a custom tag with PHP type enabled. The application decodes HTML-encoded content via undoHtmlSpecialChars() before passing it to eval() in the renderWithPhp() method, bypassing HTML Purifier sanitization, and the payload is triggered on every frontend page load through the preload event system.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
ImpressCMS 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ImpressCMS是ImpressCMS组织开源的一款网站内容管理平台。 ImpressCMS 2.0.3及之前版本存在代码注入漏洞，该漏洞源于自定义标签模块通过undoHtmlSpecialChars()解码HTML编码内容后未经HTML Purifier清理即传递给renderWithPhp()方法中的eval()函数，可能导致已认证管理员执行任意PHP代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ImpressCMS ImpressCMS 0 ~ 2.0.3 -

II. Public POCs for CVE-2026-73679

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10149 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-73679

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Vendor Advisories for CVE-2026-73679 (1)

Proof of Concept for CVE-2026-73679 (1)

IV. Related Vulnerabilities

Same product: ImpressCMS
Same vendor: ImpressCMS
Same weakness: CWE-94

V. Comments for CVE-2026-73679

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