CVE-2021-40099 json
An issue was discovered in Concrete CMS through 8.5.5.
published 2021-09-24 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27288
- cvss
- 7.2
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.1%
- EPSS 2.1% chance of exploitation in 30 days, percentile 81%
- public exploits
- 0
- none known
Summary
An issue was discovered in Concrete CMS through 8.5.5. Fetching the update json scheme over HTTP leads to remote code execution.
Exploit prediction
2.08% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.2 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
References
-
documentation.concretecms.org
/developers/introduction/version-history/856-release-notes
release-notes, vendor-advisory
-
hackerone.com
/reports/982130
permissions-required, third-party-advisory
Sources
- CVE List CVE-2021-40099
- NVD CVE-2021-40099
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.