CVE-2026-8340— Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\File::approveVersion
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Concrete CMS | Concrete CMS | 5.0≤ 9.5.0 | affected |
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I. Basic Information for CVE-2026-8340
Vulnerability Information
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Vulnerability Title
Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\File::approveVersion
Source: NVD (National Vulnerability Database)
Vulnerability Description
Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\File::approveVersion. Victim with edit_file_contents permission is CSRF'd into publishing an attacker-chosen previously-uploaded version (downgrade to an older version of a file, or activation of a co-editor's unpublished version). The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨站请求伪造(CSRF)
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Concrete CMS | Concrete CMS | 5.0 ~ 9.5.0 | - |
II. Public POCs for CVE-2026-8340
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Vendor Pages for CVE-2026-8340 (1)
- 9.5.1 Release Notes :: Concrete CMSrelease-notes
Same Patch Batch · Concrete CMS · 2026-05-22 · 3 CVEs total
| CVE-2026-8347 | Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-authorization-level in Express | |
| CVE-2026-8353 | Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XSS via page name in atomik them |
IV. Related Vulnerabilities
Same product: Concrete CMS
- CVE-2026-8353
Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XS - CVE-2026-8347
Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-a - CVE-2026-8139
Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via - CVE-2026-7890
Concrete CMS 9.5.0 is vulnerable to SSRF via RSS Displayer B - CVE-2026-8409
Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Requ
Same vendor: Concrete CMS
- CVE-2026-8353
Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XS - CVE-2026-8347
Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-a - CVE-2026-8139
Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via - CVE-2026-7890
Concrete CMS 9.5.0 is vulnerable to SSRF via RSS Displayer B - CVE-2026-8409
Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Requ
Same weakness: CWE-352
- CVE-2018-25354
Joomla Component jomres 9.11.2 Cross-Site Request Forgery - CVE-2018-25343
Smartshop 1 Cross-Site Request Forgery via editprofile.php - CVE-2026-9303
calcom cal.diy cross-site request forgery - CVE-2026-41074
RT has broken CSRF protection for authenticated users - CVE-2026-40864
JupyterHub: Cross-origin form POSTs bypass XSRF
V. Comments for CVE-2026-8340
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