CVE-2026-7888
Last modified
CVE-2026-7888 is a high-severity vulnerability rated 8.4/10 on the CVSS scale. Concrete CMS below 9.5.2 is vulnerable to PHP Object Injection via unserialize() calls in the Workflow, Form block, and File/Set components that lack the allowed_classes restriction. An unauthenticated attacker may trigger arbitrary PHP object instantiation if a malicious serialized payload has been placed in the database. EPSS estimates a 0.18% chance of exploitation in the next 30 days.
Description
Concrete CMS below 9.5.2 is vulnerable to PHP Object Injection via unserialize() calls in the Workflow, Form block, and File/Set components that lack the allowed_classes restriction. An unauthenticated attacker may trigger arbitrary PHP object instantiation if a malicious serialized payload has been placed in the database. Thanks XananasX7 and Sanjorn Keeratirungsan (dizconnect) for both independently reporting. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 8.4 with vector CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N.
Metrics
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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
Weakness Enumeration
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-7888?
How severe is CVE-2026-7888?
How do I fix CVE-2026-7888?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-7876IBM Aspera HSTS for CP4I 1.5.1 through 1.5.19 is affected by…9.1
- CVE-2026-7879In Concrete CMS 9.5.0 and below, the submit_password() meth…5.3
- CVE-2026-7881Concrete CMS 9.5.0 and below is subject to Insecure Direct O…4.3
- CVE-2026-7882Concrete CMS 9.5.0 and below is vulnerable to unauthorized …4.3
- CVE-2026-7886Concrete CMS 9.5.0 and below is vulnerable to IDOR in AddMes…4.3
- CVE-2026-7887For Concrete CMS 9.5.0 and below, OAuth 2.0 Authorization-Co…6.4
- CVE-2026-7890In Concrete CMS 9.5.0 and below, the RSS Displayer block acc…6.4
- CVE-2026-7891A vulnerability has been identified in Mendix Runtime (All v…9.1
- CVE-2026-7896Integer overflow in Blink in Google Chrome prior to 148.0.77…8.8
- CVE-2026-7897Use after free in Mobile in Google Chrome on iOS prior to 14…7.5
- CVE-2026-7898Use after free in Chromoting in Google Chrome on Linux prior…8.8
- CVE-2026-7899Out of bounds read and write in V8 in Google Chrome prior to…8.8
Are you affected by CVE-2026-7888?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST