Vulnerability details
CVE-2026-73679
ImpressCMS ImpressCMS
ImpressCMS Authenticated RCE via PHP Custom Tag eval()
CVSS 4.0
8.6High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.6High | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| 7.2High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| ImpressCMS | ImpressCMS | v ≤ 2.0.3 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://github.com/ImpressCMS/impresscms product
- https://github.com/DevVaibhav07/VULN-POC/blob/main/ImpressCMSRCCE.md technical-description
- https://www.vulncheck.com/advisories/impresscms-authenticated-rce-via-php-custom-tag-eval third-party-advisory
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Details
- Published
- 2026-08-14
- Last updated
- 2026-10-01
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
1.12%
Probability of exploitation in 30 days
66.4%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-94Improper Control of Generation of Code ('Code Injection')