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CVE-2026-76834

b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key

CVSS 4.0 9.2 CRITICALCVSS 3.1 8.1 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-76834

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-76834

Published

b2evolution CMS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "b2evolution",
                    "product": "b2evolution CMS",
                    "repo": "https://github.com/b2evolution/b2evolution",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "6.7.8",
                            "lessThanOrEqual": "7.2.5",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "packageURL": "pkg:github/b2evolution/b2evolution"
                }

Original source record · Cite this exact observation · Complete original publisher JSON