Vulnerability-Lookup

GHSA-PRXR-VJGC-2CQ9

Vulnerability from github – Published: 2026-05-21 21:30 – Updated: 2026-06-24 20:57

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.

Severity

7.5 (High)


                  
                    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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "concrete5/concrete5"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.5.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-8428"
  ],
  "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"
  },
  "details": "Concrete CMS 9.5.0 and below emits a CSRF token in the local_available_update.php view ($token-\u003eoutput(\u0027do_update\u0027)) but the corresponding do_update() method in concrete/controllers/single_page/dashboard/system/update/update.php never calls $this-\u003etoken-\u003evalidate(\u0027do_update\u0027). 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.\u00a0\u00a0In order to be vulnerable, theictim must be passing canUpgrade()anda valid update version must be present under DIR_CORE_UPDATES.",
  "id": "GHSA-prxr-vjgc-2cq9",
  "modified": "2026-06-24T20:57:51Z",
  "published": "2026-05-21T21:30:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8428"
    },
    {
      "type": "WEB",
      "url": "https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/concretecms/concretecms"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Concrete CMS is Vulnerable to Cross-Site Request Forgery"
}

CVE-2026-8428 (GCVE-0-2026-8428)

Vulnerability from cvelistv5 – Published: 2026-05-21 20:24 – Updated: 2026-05-22 13:23

Title

CSRF token is not validated in the core CMS update controller for Concrete CMS 9.5.0 and below

Summary

Severity

7.5 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-22 13:23 UTC

CWE

CWE-352 - Cross-Site request forgery (CSRF)
CWE-829 - Inclusion of functionality from untrusted control sphere

Assigner

ConcreteCMS CNA under the mitre root

CNA scorecard B 84/100 over 111 records in the last 180 days details

References

1 reference

URL	Tags
https://documentation.concretecms.org/9-x/develop…	release-notes

Impacted products

1 product

Vendor	Product	Version
Concrete CMS	Concrete CMS	Affected: 5.0 , ≤ 9.5.0 (git)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-8428",
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                "role": "CISA Coordinator",
                "timestamp": "2026-05-22T13:23:39.070790Z",
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          "defaultStatus": "unaffected",
          "product": "Concrete CMS",
          "repo": "https://github.com/concretecms/concretecms",
          "vendor": "Concrete CMS",
          "versions": [
            {
              "lessThanOrEqual": "9.5.0",
              "status": "affected",
              "version": "5.0",
              "versionType": "git"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Concrete CMS 9.5.0 and below emits a CSRF token in the \u003ccode\u003elocal_available_update.php\u003c/code\u003e view (\u003ccode\u003e$token-\u0026gt;output(\u0027do_update\u0027)\u003c/code\u003e) but the corresponding \u003ccode\u003edo_update()\u003c/code\u003e method in \u003ccode\u003econcrete/controllers/single_page/dashboard/system/update/update.php\u003c/code\u003e never calls \u003ccode\u003e$this-\u0026gt;token-\u0026gt;validate(\u0027do_update\u0027)\u003c/code\u003e. 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.\u0026nbsp;\u0026nbsp;In order to be vulnerable, theictim must be passing \u003ccode\u003ecanUpgrade()and\u003c/code\u003ea valid update version must be present under \u003ccode\u003eDIR_CORE_UPDATES\u003c/code\u003e.\u0026nbsp;The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of\u0026nbsp;7.5 with vector\u0026nbsp;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\u0026nbsp;https://github.com/maru1009\u0026nbsp;for reporting.\u003cbr\u003e"
            }
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            "baseSeverity": "HIGH",
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            "privilegesRequired": "NONE",
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          "descriptions": [
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              "cweId": "CWE-829",
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              "lang": "en",
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      "providerMetadata": {
        "dateUpdated": "2026-05-21T20:24:11.572Z",
        "orgId": "ff5b8ace-8b95-4078-9743-eac1ca5451de",
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      "references": [
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          "tags": [
            "release-notes"
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          "url": "https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes"
        }
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    "datePublished": "2026-05-21T20:24:11.572Z",
    "dateReserved": "2026-05-12T18:07:11.189Z",
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    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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