GHSA-prxr-vjgc-2cq9

Source

https://github.com/advisories/GHSA-prxr-vjgc-2cq9

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-prxr-vjgc-2cq9/GHSA-prxr-vjgc-2cq9.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-prxr-vjgc-2cq9

Aliases

CVE-2026-8428

Published

2026-05-21T21:30:38Z

Modified

2026-09-10T03:50:47Z

Severity

7.5 (High) CVSS_V4 - 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 CVSS Calculator

Summary

Concrete CMS is Vulnerable to Cross-Site Request Forgery

Details

Concrete CMS 9.5.0 and below emits a CSRF token in the local_available_update.php view ($token->output('do_update')) but the corresponding do_update() method in concrete/controllers/single_page/dashboard/system/update/update.php never calls $this->token->validate('do_update'). The form is rendered as a POST form, meaning the token reaches the browser, but because the controller discards it without verification, an attacker can craft a cross-site POST that triggers a core CMS update to an attacker-specified version string. In order to be vulnerable, theictim must be passing canUpgrade()anda valid update version must be present under DIR_CORE_UPDATES.

Database specific

{
    "cwe_ids":  [
        "CWE-352"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-06-24T18:39:42Z",
    "nvd_published_at":  "2026-05-21T21:16:34Z",
    "severity":  "HIGH"
}

References

Affected packages

Packagist / concrete5/concrete5

Package

Name: concrete5/concrete5
Purl: pkg:composer/concrete5/concrete5

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

9.5.1

Affected versions

8.*

8.0

8.0.1

8.0.2

8.0.3

8.1.0

8.2.0RC2

8.2.0

8.2.1

8.3.0

8.3.1

8.3.2

8.4.0RC3

8.4.0RC4

8.4.0

8.4.1

8.4.2

8.4.3

8.4.4

8.4.5

8.5.0RC1

8.5.0RC2

8.5.0

8.5.1

8.5.2

8.5.3

8.5.4

8.5.5

8.5.6RC1

8.5.6

8.5.7

8.5.8

8.5.9

8.5.10

8.5.11

8.5.12

8.5.13

8.5.14

8.5.15

8.5.16

8.5.17

8.5.18

8.5.19

8.5.20

8.5.21

9.*

9.0.0RC1

9.0.0RC3

9.0.0RC4

9.0.0

9.0.1

9.0.2

9.1.0

9.1.1

9.1.2

9.1.3

9.2.0RC2

9.2.0

9.2.1

9.2.2

9.2.3

9.2.4

9.2.5

9.2.6

9.2.7

9.2.8

9.2.9

9.3.0

9.3.1

9.3.2

9.3.3

9.3.4

9.3.5

9.3.6

9.3.7

9.3.8

9.3.9

9.4.0RC1

9.4.0RC2

9.4.0

9.4.1

9.4.2

9.4.3

9.4.4

9.4.5

9.4.6

9.4.7

9.4.8

9.5.0RC1

9.5.0RC2

9.5.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-prxr-vjgc-2cq9/GHSA-prxr-vjgc-2cq9.json"