{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-76834", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-08-19T20:34:00.154Z", "datePublished": "2026-09-17T15:16:50.748Z", "dateUpdated": "2026-09-18T18:04:44.762Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-17T15:16:50.748Z" }, "datePublic": "2026-07-31T00:00:00.000Z", "title": "b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key", "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." } ], "tags": [ "unsupported-when-assigned" ], "problemTypes": [ { "descriptions": [ { "lang": "en", "description": "Deserialization of Untrusted Data", "cweId": "CWE-502", "type": "CWE" } ] } ], "affected": [ { "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" } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:a:b2evolution:b2evolution_cms:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7.8", "versionEndIncluding": "7.2.5" } ] } ] } ], "metrics": [ { "format": "CVSS", "cvssV4_0": { "version": "4.0", "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", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 9.2, "baseSeverity": "CRITICAL" } }, { "format": "CVSS", "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH" } } ], "references": [ { "url": "https://gist.github.com/axg11/3e29501c33f6e1e05ac2a00107afd64e", "tags": [ "technical-description" ] }, { "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", "tags": [ "technical-description" ] }, { "url": "https://github.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f9039509710b37ee2c4d", "tags": [ "patch" ], "name": "Incomplete fix for CVE-2016-8901 (1 of 2)" }, { "url": "https://github.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55432fc74cd27", "tags": [ "patch" ], "name": "Incomplete fix for CVE-2016-8901 (2 of 2)" }, { "url": "https://github.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889f8100ebd1bb", "tags": [ "technical-description", "patch" ], "name": "Introduces the flawed regular expression, first released in 6.7.8" }, { "url": "https://b2evolution.net/news/2022/03/26/2022-update-eol", "tags": [ "vendor-advisory" ], "name": "b2evolution CMS end-of-life announcement" }, { "url": "https://github.com/b2evolution/b2evolution", "tags": [ "product" ] }, { "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" } ], "credits": [ { "lang": "en", "value": "Adrian Gaitan", "type": "finder" }, { "lang": "en", "value": "VulnCheck", "type": "coordinator" } ], "x_generator": { "engine": "vulncheck-endgame" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-09-18T18:04:36.961014Z", "id": "CVE-2026-76834", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-18T18:04:44.762Z" } } ] } }