CVEDB API

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-8426

Concrete CMS 9.5.0 and below does not validate a CSRF token before processing requests to /dashboard/extend/update/prepare_remote_upgrade/<remoteMPID>. An attacker who controls the remote package returned for a known marketplace item ID can overwrite the package PHP on disk and force its upgrade() method to execute in a single browser navigation. This results in remote code execution as the web server user. In order to be vulnerable, the victim must be passing canInstallPackages, victim site must be connected to the Concrete marketplace; and the attacker controls the package returned for a marketplace item ID already installed on the victim site. 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 22.8%

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-2026-8426

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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Vulnerable Software

Vulnerability Details CVE-2026-8426

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