CVE-2026-10721

Object injection via unrestricted database deserialization

Published Jun 10, 2026 · Updated Jun 10, 2026

PHP object injection in Concrete CMS before 9.5.2 allows attackers to instantiate arbitrary PHP objects from database records. Permission, Cache, and Search code passes serialized database values to unserialize() without restricting allowed classes, enabling attacker-selected object construction. Exploitation requires a malicious serialized payload already present in the database; published sources identify no gadget chain or resulting code-execution path.

CVSS severity8.4
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

PHP object injection in Concrete CMS before 9.5.2 allows attackers to instantiate arbitrary PHP objects from database records. Permission, Cache, and Search code passes serialized database values to unserialize() without restricting allowed classes, enabling attacker-selected object construction. Exploitation requires a malicious serialized payload already present in the database; published sources identify no gadget chain or resulting code-execution path.

The record

CVE
CVE-2026-10721
Published
Jun 10, 2026
Updated
Jun 10, 2026
Vendor
Concrete CMS
Product
Concrete CMS
Classifications
CWE-502
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5 <=9.5.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Concrete CMS · Concrete CMSversion=5 <=9.5.1

Published CVSS scores

8.4Concrete CMS security teamCVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo