Vulnerability-Lookup

GHSA-PRXR-VJGC-2CQ9

Vulnerability from github – Published: 2026-05-21 21:30 – Updated: 2026-05-21 21:30

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. 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.

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": [],
  "aliases": [
    "CVE-2026-8428"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-352"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "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.\u00a0The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of\u00a07.5 with vector\u00a0CVSS: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\u00a0https://github.com/maru1009\u00a0for reporting.",
  "id": "GHSA-prxr-vjgc-2cq9",
  "modified": "2026-05-21T21:30:38Z",
  "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"
    }
  ],
  "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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

CWE

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

Assigner

ConcreteCMS

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)

Show details on NVD website

JSON

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  "containers": {
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      {
        "metrics": [
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              "content": {
                "id": "CVE-2026-8428",
                "options": [
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                  },
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                  },
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                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-22T13:23:39.070790Z",
                "version": "2.0.3"
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          "collectionURL": "https://github.com/concretecms/concretecms",
          "defaultStatus": "unaffected",
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          "repo": "https://github.com/concretecms/concretecms",
          "vendor": "Concrete CMS",
          "versions": [
            {
              "lessThanOrEqual": "9.5.0",
              "status": "affected",
              "version": "5.0",
              "versionType": "git"
            }
          ]
        }
      ],
      "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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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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        {
          "descriptions": [
            {
              "cweId": "CWE-829",
              "description": "CWE-829 Inclusion of functionality from untrusted control sphere",
              "lang": "en",
              "type": "CWE"
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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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            "release-notes"
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          "url": "https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes"
        }
      ],
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      },
      "title": "CSRF token is not validated in the core CMS update controller for Concrete CMS 9.5.0 and below",
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    "datePublished": "2026-05-21T20:24:11.572Z",
    "dateReserved": "2026-05-12T18:07:11.189Z",
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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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-PRXR-VJGC-2CQ9

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

Tags

Sightings

Nomenclature