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High severity7.2NVD Advisory· Published Sep 24, 2021· Updated Jun 17, 2026

CVE-2021-40099

CVE-2021-40099

Description

An issue was discovered in Concrete CMS through 8.5.5. Fetching the update json scheme over HTTP leads to remote code execution.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3

Concrete5/Concrete52 versions
cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*range: <=8.5.5
- (no CPE)range: <=8.5.5
Concrete CMS/Concrete CMSdescription

Patches

Vulnerability mechanics

References

2

documentation.concretecms.org/developers/introduction/version-history/856-release-notesnvdRelease NotesVendor Advisory
hackerone.com/reports/982130nvdPermissions RequiredThird Party Advisory

News mentions

0

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