CVE-2026-76834

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Source
https://cve.org/CVERecord?id=CVE-2026-76834
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-76834.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-76834
Published
2026-09-17T15:16:50Z
Modified
2026-09-18T03:48:29Z
Severity
  • 9.2 (Critical) CVSS_V4 - 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 CVSS Calculator
Summary
b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key
Details

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.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-502"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76834.json"
}
References

Affected packages

Git / github.com/b2evolution/b2evolution

Affected ranges

Type
GIT
Repo
https://github.com/b2evolution/b2evolution
Events
Introduced
baf4c9d1245b0149dca900b50e812b059c011b31
Last Affected
a7920fa31b433793ff59c14f70e6f01f613f595f
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "6.7.8"
        },
        {
            "last_affected": "7.2.5"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-76834.json"