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Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-8421

Concrete CMS 9.5.0 and below contains a CSRF vulnerability in the install_package() method of concrete/controllers/single_page/dashboard/extend/install.php. An attacker who can cause an authenticated administrator to visit a crafted page, and who has placed or caused a package to be present under DIR_PACKAGES/<handle>/, can force the installation of that package without any CSRF protection. Package installation executes the package controller's install() method as the web server user, enabling remote code execution. In order to be vulnerable, the victim must be passing canInstallPackages. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 7.5 with vector CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks https://github.com/maru1009 for reporting.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.001

EPSS Ranking 22.6%

CVSS Severity

CVSS v3 Score 8.8

References

https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes

Products affected by CVE-2026-8421

Concretecms » Concrete Cms » Version: N/A

cpe:2.3:a:concretecms:concrete_cms:-
Concretecms » Concrete Cms » Version: 5.4.1.1

cpe:2.3:a:concretecms:concrete_cms:5.4.1.1
Concretecms » Concrete Cms » Version: 5.4.2

cpe:2.3:a:concretecms:concrete_cms:5.4.2
Concretecms » Concrete Cms » Version: 5.4.2.1

cpe:2.3:a:concretecms:concrete_cms:5.4.2.1
Concretecms » Concrete Cms » Version: 5.4.2.2

cpe:2.3:a:concretecms:concrete_cms:5.4.2.2
Concretecms » Concrete Cms » Version: 5.6.1

cpe:2.3:a:concretecms:concrete_cms:5.6.1
Concretecms » Concrete Cms » Version: 5.6.1.1

cpe:2.3:a:concretecms:concrete_cms:5.6.1.1
Concretecms » Concrete Cms » Version: 5.6.1.2

cpe:2.3:a:concretecms:concrete_cms:5.6.1.2
Concretecms » Concrete Cms » Version: 5.6.2

cpe:2.3:a:concretecms:concrete_cms:5.6.2
Concretecms » Concrete Cms » Version: 5.6.2.1

cpe:2.3:a:concretecms:concrete_cms:5.6.2.1
Concretecms » Concrete Cms » Version: 5.6.3

cpe:2.3:a:concretecms:concrete_cms:5.6.3
Concretecms » Concrete Cms » Version: 5.6.3.1

cpe:2.3:a:concretecms:concrete_cms:5.6.3.1
Concretecms » Concrete Cms » Version: 5.6.3.3

cpe:2.3:a:concretecms:concrete_cms:5.6.3.3
Concretecms » Concrete Cms » Version: 5.6.3.4

cpe:2.3:a:concretecms:concrete_cms:5.6.3.4
Concretecms » Concrete Cms » Version: 5.6.3.5

cpe:2.3:a:concretecms:concrete_cms:5.6.3.5
Concretecms » Concrete Cms » Version: 5.6.4.0

cpe:2.3:a:concretecms:concrete_cms:5.6.4.0
Concretecms » Concrete Cms » Version: 5.7.0

cpe:2.3:a:concretecms:concrete_cms:5.7.0
Concretecms » Concrete Cms » Version: 5.7.0.1

cpe:2.3:a:concretecms:concrete_cms:5.7.0.1
Concretecms » Concrete Cms » Version: 5.7.0.3

cpe:2.3:a:concretecms:concrete_cms:5.7.0.3
Concretecms » Concrete Cms » Version: 5.7.0.4

cpe:2.3:a:concretecms:concrete_cms:5.7.0.4
Concretecms » Concrete Cms » Version: 5.7.1

cpe:2.3:a:concretecms:concrete_cms:5.7.1
Concretecms » Concrete Cms » Version: 5.7.2

cpe:2.3:a:concretecms:concrete_cms:5.7.2
Concretecms » Concrete Cms » Version: 5.7.2.1

cpe:2.3:a:concretecms:concrete_cms:5.7.2.1
Concretecms » Concrete Cms » Version: 5.7.3

cpe:2.3:a:concretecms:concrete_cms:5.7.3
Concretecms » Concrete Cms » Version: 5.7.3.1

cpe:2.3:a:concretecms:concrete_cms:5.7.3.1
Concretecms » Concrete Cms » Version: 5.7.4

cpe:2.3:a:concretecms:concrete_cms:5.7.4
Concretecms » Concrete Cms » Version: 5.7.4.1

cpe:2.3:a:concretecms:concrete_cms:5.7.4.1
Concretecms » Concrete Cms » Version: 5.7.4.2

cpe:2.3:a:concretecms:concrete_cms:5.7.4.2
Concretecms » Concrete Cms » Version: 5.7.5

cpe:2.3:a:concretecms:concrete_cms:5.7.5
Concretecms » Concrete Cms » Version: 5.7.5.1

cpe:2.3:a:concretecms:concrete_cms:5.7.5.1
Concretecms » Concrete Cms » Version: 5.7.5.10

cpe:2.3:a:concretecms:concrete_cms:5.7.5.10
Concretecms » Concrete Cms » Version: 5.7.5.11

cpe:2.3:a:concretecms:concrete_cms:5.7.5.11
Concretecms » Concrete Cms » Version: 5.7.5.12

cpe:2.3:a:concretecms:concrete_cms:5.7.5.12
Concretecms » Concrete Cms » Version: 5.7.5.13

cpe:2.3:a:concretecms:concrete_cms:5.7.5.13
Concretecms » Concrete Cms » Version: 5.7.5.2

cpe:2.3:a:concretecms:concrete_cms:5.7.5.2
Concretecms » Concrete Cms » Version: 5.7.5.3

cpe:2.3:a:concretecms:concrete_cms:5.7.5.3
Concretecms » Concrete Cms » Version: 5.7.5.4

cpe:2.3:a:concretecms:concrete_cms:5.7.5.4
Concretecms » Concrete Cms » Version: 5.7.5.5

cpe:2.3:a:concretecms:concrete_cms:5.7.5.5
Concretecms » Concrete Cms » Version: 5.7.5.6

cpe:2.3:a:concretecms:concrete_cms:5.7.5.6
Concretecms » Concrete Cms » Version: 5.7.5.7

cpe:2.3:a:concretecms:concrete_cms:5.7.5.7
Concretecms » Concrete Cms » Version: 5.7.5.8

cpe:2.3:a:concretecms:concrete_cms:5.7.5.8
Concretecms » Concrete Cms » Version: 5.7.5.9

cpe:2.3:a:concretecms:concrete_cms:5.7.5.9
Concretecms » Concrete Cms » Version: 5.8.1.0

cpe:2.3:a:concretecms:concrete_cms:5.8.1.0
Concretecms » Concrete Cms » Version: 5.8.2.0

cpe:2.3:a:concretecms:concrete_cms:5.8.2.0
Concretecms » Concrete Cms » Version: 8.0

cpe:2.3:a:concretecms:concrete_cms:8.0
Concretecms » Concrete Cms » Version: 8.0.1

cpe:2.3:a:concretecms:concrete_cms:8.0.1
Concretecms » Concrete Cms » Version: 8.0.2

cpe:2.3:a:concretecms:concrete_cms:8.0.2
Concretecms » Concrete Cms » Version: 8.0.3

cpe:2.3:a:concretecms:concrete_cms:8.0.3
Concretecms » Concrete Cms » Version: 8.1.0

cpe:2.3:a:concretecms:concrete_cms:8.1.0
Concretecms » Concrete Cms » Version: 8.2.0

cpe:2.3:a:concretecms:concrete_cms:8.2.0
Concretecms » Concrete Cms » Version: 8.2.1

cpe:2.3:a:concretecms:concrete_cms:8.2.1
Concretecms » Concrete Cms » Version: 8.3.0

cpe:2.3:a:concretecms:concrete_cms:8.3.0
Concretecms » Concrete Cms » Version: 8.3.1

cpe:2.3:a:concretecms:concrete_cms:8.3.1
Concretecms » Concrete Cms » Version: 8.3.2

cpe:2.3:a:concretecms:concrete_cms:8.3.2
Concretecms » Concrete Cms » Version: 8.4.0

cpe:2.3:a:concretecms:concrete_cms:8.4.0
Concretecms » Concrete Cms » Version: 8.4.1

cpe:2.3:a:concretecms:concrete_cms:8.4.1
Concretecms » Concrete Cms » Version: 8.4.2

cpe:2.3:a:concretecms:concrete_cms:8.4.2
Concretecms » Concrete Cms » Version: 8.4.3

cpe:2.3:a:concretecms:concrete_cms:8.4.3
Concretecms » Concrete Cms » Version: 8.4.4

cpe:2.3:a:concretecms:concrete_cms:8.4.4
Concretecms » Concrete Cms » Version: 8.4.5

cpe:2.3:a:concretecms:concrete_cms:8.4.5
Concretecms » Concrete Cms » Version: 8.5.0

cpe:2.3:a:concretecms:concrete_cms:8.5.0
Concretecms » Concrete Cms » Version: 8.5.1

cpe:2.3:a:concretecms:concrete_cms:8.5.1
Concretecms » Concrete Cms » Version: 8.5.10

cpe:2.3:a:concretecms:concrete_cms:8.5.10
Concretecms » Concrete Cms » Version: 8.5.11

cpe:2.3:a:concretecms:concrete_cms:8.5.11
Concretecms » Concrete Cms » Version: 8.5.12

cpe:2.3:a:concretecms:concrete_cms:8.5.12
Concretecms » Concrete Cms » Version: 8.5.13

cpe:2.3:a:concretecms:concrete_cms:8.5.13
Concretecms » Concrete Cms » Version: 8.5.14

cpe:2.3:a:concretecms:concrete_cms:8.5.14
Concretecms » Concrete Cms » Version: 8.5.15

cpe:2.3:a:concretecms:concrete_cms:8.5.15
Concretecms » Concrete Cms » Version: 8.5.16

cpe:2.3:a:concretecms:concrete_cms:8.5.16
Concretecms » Concrete Cms » Version: 8.5.17

cpe:2.3:a:concretecms:concrete_cms:8.5.17
Concretecms » Concrete Cms » Version: 8.5.18

cpe:2.3:a:concretecms:concrete_cms:8.5.18
Concretecms » Concrete Cms » Version: 8.5.19

cpe:2.3:a:concretecms:concrete_cms:8.5.19
Concretecms » Concrete Cms » Version: 8.5.2

cpe:2.3:a:concretecms:concrete_cms:8.5.2
Concretecms » Concrete Cms » Version: 8.5.20

cpe:2.3:a:concretecms:concrete_cms:8.5.20
Concretecms » Concrete Cms » Version: 8.5.21

cpe:2.3:a:concretecms:concrete_cms:8.5.21
Concretecms » Concrete Cms » Version: 8.5.3

cpe:2.3:a:concretecms:concrete_cms:8.5.3
Concretecms » Concrete Cms » Version: 8.5.4

cpe:2.3:a:concretecms:concrete_cms:8.5.4
Concretecms » Concrete Cms » Version: 8.5.5

cpe:2.3:a:concretecms:concrete_cms:8.5.5
Concretecms » Concrete Cms » Version: 8.5.6

cpe:2.3:a:concretecms:concrete_cms:8.5.6
Concretecms » Concrete Cms » Version: 8.5.7

cpe:2.3:a:concretecms:concrete_cms:8.5.7
Concretecms » Concrete Cms » Version: 8.5.8

cpe:2.3:a:concretecms:concrete_cms:8.5.8
Concretecms » Concrete Cms » Version: 8.5.9

cpe:2.3:a:concretecms:concrete_cms:8.5.9
Concretecms » Concrete Cms » Version: 9.0

cpe:2.3:a:concretecms:concrete_cms:9.0
Concretecms » Concrete Cms » Version: 9.0.0

cpe:2.3:a:concretecms:concrete_cms:9.0.0
Concretecms » Concrete Cms » Version: 9.0.1

cpe:2.3:a:concretecms:concrete_cms:9.0.1
Concretecms » Concrete Cms » Version: 9.0.2

cpe:2.3:a:concretecms:concrete_cms:9.0.2
Concretecms » Concrete Cms » Version: 9.1.0

cpe:2.3:a:concretecms:concrete_cms:9.1.0
Concretecms » Concrete Cms » Version: 9.1.1

cpe:2.3:a:concretecms:concrete_cms:9.1.1
Concretecms » Concrete Cms » Version: 9.1.2

cpe:2.3:a:concretecms:concrete_cms:9.1.2
Concretecms » Concrete Cms » Version: 9.1.3

cpe:2.3:a:concretecms:concrete_cms:9.1.3
Concretecms » Concrete Cms » Version: 9.2.0

cpe:2.3:a:concretecms:concrete_cms:9.2.0
Concretecms » Concrete Cms » Version: 9.2.1

cpe:2.3:a:concretecms:concrete_cms:9.2.1
Concretecms » Concrete Cms » Version: 9.2.2

cpe:2.3:a:concretecms:concrete_cms:9.2.2
Concretecms » Concrete Cms » Version: 9.2.3

cpe:2.3:a:concretecms:concrete_cms:9.2.3
Concretecms » Concrete Cms » Version: 9.2.4

cpe:2.3:a:concretecms:concrete_cms:9.2.4
Concretecms » Concrete Cms » Version: 9.2.5

cpe:2.3:a:concretecms:concrete_cms:9.2.5
Concretecms » Concrete Cms » Version: 9.2.6

cpe:2.3:a:concretecms:concrete_cms:9.2.6
Concretecms » Concrete Cms » Version: 9.2.7

cpe:2.3:a:concretecms:concrete_cms:9.2.7
Concretecms » Concrete Cms » Version: 9.2.8

cpe:2.3:a:concretecms:concrete_cms:9.2.8
Concretecms » Concrete Cms » Version: 9.2.9

cpe:2.3:a:concretecms:concrete_cms:9.2.9
Concretecms » Concrete Cms » Version: 9.3.0

cpe:2.3:a:concretecms:concrete_cms:9.3.0
Concretecms » Concrete Cms » Version: 9.3.1

cpe:2.3:a:concretecms:concrete_cms:9.3.1
Concretecms » Concrete Cms » Version: 9.3.2

cpe:2.3:a:concretecms:concrete_cms:9.3.2
Concretecms » Concrete Cms » Version: 9.3.3

cpe:2.3:a:concretecms:concrete_cms:9.3.3
Concretecms » Concrete Cms » Version: 9.3.4

cpe:2.3:a:concretecms:concrete_cms:9.3.4
Concretecms » Concrete Cms » Version: 9.3.5

cpe:2.3:a:concretecms:concrete_cms:9.3.5
Concretecms » Concrete Cms » Version: 9.3.6

cpe:2.3:a:concretecms:concrete_cms:9.3.6
Concretecms » Concrete Cms » Version: 9.3.7

cpe:2.3:a:concretecms:concrete_cms:9.3.7
Concretecms » Concrete Cms » Version: 9.3.8

cpe:2.3:a:concretecms:concrete_cms:9.3.8
Concretecms » Concrete Cms » Version: 9.3.9

cpe:2.3:a:concretecms:concrete_cms:9.3.9
Concretecms » Concrete Cms » Version: 9.4.0

cpe:2.3:a:concretecms:concrete_cms:9.4.0
Concretecms » Concrete Cms » Version: 9.4.1

cpe:2.3:a:concretecms:concrete_cms:9.4.1
Concretecms » Concrete Cms » Version: 9.4.2

cpe:2.3:a:concretecms:concrete_cms:9.4.2
Concretecms » Concrete Cms » Version: 9.4.3

cpe:2.3:a:concretecms:concrete_cms:9.4.3
Concretecms » Concrete Cms » Version: 9.4.4

cpe:2.3:a:concretecms:concrete_cms:9.4.4
Concretecms » Concrete Cms » Version: 9.4.5

cpe:2.3:a:concretecms:concrete_cms:9.4.5
Concretecms » Concrete Cms » Version: 9.4.6

cpe:2.3:a:concretecms:concrete_cms:9.4.6
Concretecms » Concrete Cms » Version: 9.4.7

cpe:2.3:a:concretecms:concrete_cms:9.4.7
Concretecms » Concrete Cms » Version: 9.4.8

cpe:2.3:a:concretecms:concrete_cms:9.4.8
Concretecms » Concrete Cms » Version: 9.5.0

cpe:2.3:a:concretecms:concrete_cms:9.5.0

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Vulnerability Details CVE-2026-8421

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