Critical severity · published Sep 27, 2021
CVE-2021-40098
An issue was discovered in Concrete CMS through 8.5.5
9.8
CVSS
1.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.6% · higher than 76% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CC
Concrete Cms · Concretecms
through 8.5.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-40098
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-40098
Release Notes
https://documentation.concretecms.org/developers/introduction/version-history/856-release-notes
Permissions Required
https://hackerone.com/reports/1102080
More from Concrete Cms
9.8
CVE-2023-48648
Concrete CMS before 8.5.13 and 9.x before 9.2.2 allows unauthorized access because directories can be created with insecure permissions
9.8
CVE-2022-21829
Concrete CMS Versions 9.0.0 through 9.0.2 and 8.5.7 and below can download zip files over HTTP and execute code from those zip files which could lead to an RCE
9.8
CVE-2021-22958
A Server-Side Request Forgery vulnerability was found in concrete5 < 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost…
9.6
CVE-2026-85385
Concrete CMS below 9.5.4 is vulnerable to Stored XSS via User Timezone Field
9.1
CVE-2022-30117
Concrete 8.5.7 and below as well as Concrete 9.0 through 9.0.2 allow traversal in /index.php/ccm/system/file/upload which could result in an Arbitrary File Delete exploit