CVE Explorer
CVE-2026-7888
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 wit
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"collectionURL":"https://github.com/concretecms/concretecms","defaultStatus":"unaffected","product":"Concrete CMS","repo":"https://github.com/concretecms/concretecms","vendor":"Concrete CMS","versions":[{"lessThan":"9.5.2","status":"affected","version":"5.0","versionType":"git"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:255193af4f7e14bae4700588ede04f54977ee43dbfbdca43723a80586fb1cec2 · sha256:2707cd5adbba8ea0… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"LOCAL","baseScore":8.4,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"HIGH","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HI…
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:255193af4f7e14bae4700588ede04f54977ee43dbfbdca43723a80586fb1cec2 · sha256:2707cd5adbba8ea0… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-502","description":"CWE-502 Deserialization of untrusted data","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:255193af4f7e14bae4700588ede04f54977ee43dbfbdca43723a80586fb1cec2 · sha256:2707cd5adbba8ea0… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"tags":["release-notes"],"url":"https://documentation.concretecms.org/9-x/developers/introduction/version-history/952-release-notes"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:255193af4f7e14bae4700588ede04f54977ee43dbfbdca43723a80586fb1cec2 · sha256:2707cd5adbba8ea0… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.