GHSA-52pr-7vmf-2w7x: concrete5/concrete5 (CVE-2026-7888)

Concrete CMS is vulnerable to PHP Object Injection via unserialize() calls in the Workflow, Form block, and File/Set components

CVSS 8.4 HighEPSS 0.0015 · 4th percentile

Published by the GitHub Advisory Database at 3 Jun 2026, 21:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
concrete5/concrete5	Packagist	<9.5.2	9.5.2

Identifiers

GHSA-52pr-7vmf-2w7x · CVE-2026-7888 · PKSA-93vh-t1hn-q1kn

Weakness (CWE)

CWE-502

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.4	High	4.0	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	CNA (ConcreteCMS)

CISA KEV Not listed.
EPSS 0.0015, the 4th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 3 Jun 2026. New records show when each source confirmed them.

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.