CVE-2026-8327Network attack vector

Account-security bypass via unfiltered profile updates

Published May 21, 2026 · Updated May 21, 2026

Improper privilege management in Concrete CMS 9.5.0 and earlier allows remote authenticated users to alter account security settings. The user-profile edit controller passes the raw POST array to UserInfo::update() without a field allowlist, exposing password and IP-pinning attributes. Any registered user can change the account password without the current password and disable per-user IP pinning intended to detect session hijacking.

CVSS severity5.3
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper privilege management in Concrete CMS 9.5.0 and earlier allows remote authenticated users to alter account security settings. The user-profile edit controller passes the raw POST array to UserInfo::update() without a field allowlist, exposing password and IP-pinning attributes. Any registered user can change the account password without the current password and disable per-user IP pinning intended to detect session hijacking.

The record

CVE
CVE-2026-8327
Published
May 21, 2026
Updated
May 21, 2026
Vendor
Concrete CMS
Product
Concrete CMS
Classifications
CWE-269, CWE-915, CWE-620, CAPEC-77, T1562.001, T1098
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2026CVE publishedPublication date reported by the CVE source.
  2. May 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=5 <=9.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Concrete CMS · Concrete CMSversion=5 <=9.5.0

Published CVSS scores

4.3NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
5.3ConcreteCMSCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes
CWE-620Unverified Password Change
CAPEC-77Manipulating User-Controlled Variables
T1562.001Impair Defenses: Disable or Modify Tools
T1098Account Manipulation

Public exploit references

No public exploit references are available in this record.

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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