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CVE-2026-8327

🔶 medium
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Summary

Concrete CMS below 9.5.0 and below is vulnerable to password change without reauthorization and session-hardening bypass. The user-profile edit controller passes the entire raw POST array to UserInfo::update() without field whitelisting resulting in password change without requiring the current password  and also resulting in registered users able to disable the per-user-IP-pinning in the session validator which is meant to detect hijacking.  The Concrete CMS security team gave this vulnerabilit

Description

Concrete CMS below 9.5.0 and below is vulnerable to password change without reauthorization and session-hardening bypass. The user-profile edit controller passes the entire raw POST array to UserInfo::update() without field whitelisting resulting in password change without requiring the current password  and also resulting in registered users able to disable the per-user-IP-pinning in the session validator which is meant to detect hijacking.  The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 5.3 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks 0x4c616e for reporting.

CVSS Score
4.3
Medium
EPSS Score
0.0
Exploit Probability
Published Date
2026-05-21
First Seen: 2026-05-22
📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 5.4% of all 333,415 vulnerabilities in our database.

#315,411
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 22, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Partial
Limited system impact
🏆 Discovered By
0x4c616e
SSVC data provided by CISA
Last Modified 2026-05-26
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS Vector 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE IDs (Weakness Types)
CWE-269 CWE-620 CWE-915

📦 Affected Products 1

Vendor Product Status Affected Versions
concretecms concrete_cms Affected
< 9.5.1

🔗 References 1

https://documentation.concretecms.org/9-x/developers...
Release Notes

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-8340 🔶 medium 4.3 0.0 Concrete CMS 9.5.0 and below is vulnerable to CSRF via Backend\File::approveVersion. Victim with edit_file_contents p... 2026-05-22
CVE-2026-8347 🔶 medium 4.3 0.0 Concrete CMS 9.5.0 and below is vulnerable to IDOR + wrong-authorization-level in the Express association Reorder dialog... 2026-05-22
CVE-2026-8353 🔶 medium 4.8 0.0 Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XSS via page name in the Atomik theme. A rogue editor can inj... 2026-05-22
CVE-2026-6826 🔶 medium 5.3 0.0 Concrete CMS 9.5.0 and below  is vulnerable to unauthenticated file usage disclosure via missing permission check in t... 2026-05-21
CVE-2026-8134 ⚠️ high 7.2 0.5 Concrete CMS 9.5.0 and below fails to sanitize path traversal sequences in the ptComposerFormLayoutSetControlCustomTempl... 2026-05-21
CVE-2026-8135 ⚠️ high 7.2 0.2 Concrete CMS 9.5.0 and below is vulnerable to Remote Code Execution due to insecure deserialization occurring in the E... 2026-05-21
These CVEs affect the same products