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    2 vulnerabilities found for b2evolution CMS by b2evolution

    CVE-2026-76834 (GCVE-0-2026-76834)

    Vulnerability from nvd – Published: 2026-09-17 15:16 – Updated: 2026-09-17 15:16 Unsupported When Assigned
    VLAI
    Title
    b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key
    Summary
    b2evolution CMS versions 6.7.8 through 7.2.5 contain an incomplete fix for CVE-2016-8901 where the serialized-array object check in param_check_serialized_array() fails to reject payloads with negative integer array keys. Unauthenticated attackers can submit crafted serialized PHP objects via POST requests to htsrv/call_plugin.php that bypass validation and reach unserialize(), instantiating arbitrary PHP objects with attacker-chosen properties that may enable code execution if suitable POP gadget chains exist.
    Severity
    9.2 (Critical)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
    8.1 (High)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
    CWE
    • CWE-502 - Deserialization of Untrusted Data
    Assigner
    References
    Impacted products
    Vendor Product Version
    b2evolution b2evolution CMS Affected: 6.7.8 , ≤ 7.2.5 (semver)
        cpe:2.3:a:b2evolution:b2evolution_cms:*:*:*:*:*:*:*:*
    		Create a notification for this product.
    Date Public
    2026-07-31 00:00
    Credits
    Adrian Gaitan VulnCheck
    Show details on NVD website
    To clipboard 

    {
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/b2evolution/b2evolution",
          "product": "b2evolution CMS",
          "repo": "https://github.com/b2evolution/b2evolution",
          "vendor": "b2evolution",
          "versions": [
            {
              "lessThanOrEqual": "7.2.5",
              "status": "affected",
              "version": "6.7.8",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:b2evolution:b2evolution_cms:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "7.2.5",
                  "versionStartIncluding": "6.7.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Adrian Gaitan"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "VulnCheck"
        }
      ],
      "datePublic": "2026-07-31T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "b2evolution CMS versions 6.7.8 through 7.2.5 contain an incomplete fix for CVE-2016-8901 where the serialized-array object check in param_check_serialized_array() fails to reject payloads with negative integer array keys. Unauthenticated attackers can submit crafted serialized PHP objects via POST requests to htsrv/call_plugin.php that bypass validation and reach unserialize(), instantiating arbitrary PHP objects with attacker-chosen properties that may enable code execution if suitable POP gadget chains exist."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 9.2,
            "baseSeverity": "CRITICAL",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
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            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          },
          "format": "CVSS"
        },
        {
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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      ],
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            {
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              "description": "Deserialization of Untrusted Data",
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          ]
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      ],
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        },
        {
          "tags": [
            "technical-description"
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          "url": "https://github.com/b2evolution/b2evolution/blob/7.2.5/inc/_core/_param.funcs.php#L2860"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/b2evolution/b2evolution/blob/7.2.5/htsrv/call_plugin.php#L49"
        },
        {
          "name": "Incomplete fix for CVE-2016-8901 (1 of 2)",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f9039509710b37ee2c4d"
        },
        {
          "name": "Incomplete fix for CVE-2016-8901 (2 of 2)",
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          ],
          "url": "https://github.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55432fc74cd27"
        },
        {
          "name": "Introduces the flawed regular expression, first released in 6.7.8",
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            "technical-description",
            "patch"
          ],
          "url": "https://github.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889f8100ebd1bb"
        },
        {
          "name": "b2evolution CMS end-of-life announcement",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://b2evolution.net/news/2022/03/26/2022-update-eol"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/b2evolution/b2evolution"
        },
        {
          "name": "VulnCheck Advisory: b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/b2evolution-cms-6.7.8-through-7.2.5-object-injection-via-negative-integer-array-key"
        }
      ],
      "tags": [
        "unsupported-when-assigned"
      ],
      "title": "b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-76834",
    "datePublished": "2026-09-17T15:16:50.748Z",
    "dateReserved": "2026-08-19T20:34:00.154Z",
    "dateUpdated": "2026-09-17T15:16:50.748Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-76834 (GCVE-0-2026-76834)

    Vulnerability from cvelistv5 – Published: 2026-09-17 15:16 – Updated: 2026-09-17 15:16 Unsupported When Assigned
    VLAI
    Title
    b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key
    Summary
    b2evolution CMS versions 6.7.8 through 7.2.5 contain an incomplete fix for CVE-2016-8901 where the serialized-array object check in param_check_serialized_array() fails to reject payloads with negative integer array keys. Unauthenticated attackers can submit crafted serialized PHP objects via POST requests to htsrv/call_plugin.php that bypass validation and reach unserialize(), instantiating arbitrary PHP objects with attacker-chosen properties that may enable code execution if suitable POP gadget chains exist.
    Severity
    9.2 (Critical)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
    8.1 (High)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
    CWE
    • CWE-502 - Deserialization of Untrusted Data
    Assigner
    References
    Impacted products
    Vendor Product Version
    b2evolution b2evolution CMS Affected: 6.7.8 , ≤ 7.2.5 (semver)
        cpe:2.3:a:b2evolution:b2evolution_cms:*:*:*:*:*:*:*:*
    		Create a notification for this product.
    Date Public
    2026-07-31 00:00
    Credits
    Adrian Gaitan VulnCheck
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:github/b2evolution/b2evolution",
          "product": "b2evolution CMS",
          "repo": "https://github.com/b2evolution/b2evolution",
          "vendor": "b2evolution",
          "versions": [
            {
              "lessThanOrEqual": "7.2.5",
              "status": "affected",
              "version": "6.7.8",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:b2evolution:b2evolution_cms:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "7.2.5",
                  "versionStartIncluding": "6.7.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Adrian Gaitan"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "VulnCheck"
        }
      ],
      "datePublic": "2026-07-31T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
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        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 9.2,
            "baseSeverity": "CRITICAL",
            "privilegesRequired": "NONE",
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            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
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            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          },
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        },
        {
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            "attackVector": "NETWORK",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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          },
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      ],
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          "tags": [
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        {
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          "url": "https://b2evolution.net/news/2022/03/26/2022-update-eol"
        },
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