CVE-2021-40098

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

An issue was discovered in Concrete CMS through 8.5.5. Path Traversal leading to RCE via external form by adding a regular expression.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-22

Affected software

VendorProductVersions
n/an/an/a

References

Timeline

Published
Sep 27, 2021
Last modified
Jun 17, 2026
NVD status
Modified

Related CVEs from 2021

CVE-2021-400997.2An issue was discovered in Concrete CMS through 8.5.5. Fetching the update json scheme over HTTP leads to remote code execution.CVE-2021-40107.8A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SProcScreenSaverSCVE-2021-401005.4An issue was discovered in Concrete CMS through 8.5.5. Stored XSS can occur in Conversations when the Active Conversation Editor is set to RCVE-2021-401017.2An issue was discovered in Concrete CMS before 8.5.7. The Dashboard allows a user's password to be changed without a prompt for the current CVE-2021-401029.1An issue was discovered in Concrete CMS through 8.5.5. Arbitrary File deletion can occur via PHAR deserialization in is_dir (PHP Object InjeCVE-2021-401037.5An issue was discovered in Concrete CMS through 8.5.5. Path Traversal can lead to Arbitrary File Reading and SSRF.CVE-2021-401047.5An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.CVE-2021-401056.1An issue was discovered in Concrete CMS through 8.5.5. There is XSS via Markdown Comments.CVE-2021-401066.1An issue was discovered in Concrete CMS through 8.5.5. There is unauthenticated stored XSS in blog comments via the website field.CVE-2021-401088.8An issue was discovered in Concrete CMS through 8.5.5. The Calendar is vulnerable to CSRF. ccm_token is not verified on the ccm/calendar/diaCVE-2021-401096.4A SSRF issue was discovered in Concrete CMS through 8.5.5. Users can access forbidden files on their local network. A user with permissions CVE-2021-40117.8A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SwapCreateRegiste
CVE-2021-40098: Critical severity, CVSS 9.8 | Vulnix