EUVD-2026-81681
GHSA-2vrr-cgr4-gfmm
Severity by source
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/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
Unauthenticated network endpoint (AV:N/PR:N/UI:N); AC:H because reliable code execution depends on a suitable POP gadget chain existing; full C/I/A impact when a chain is available; scope unchanged.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Unauthenticated PHP object injection in b2evolution CMS 6.7.8 through 7.2.5 lets remote attackers POST crafted serialized payloads to htsrv/call_plugin.php that bypass the incomplete CVE-2016-8901 validation fix and reach unserialize(), instantiating arbitrary PHP objects with attacker-chosen properties. The vendor rates this 9.2 (CVSS 4.0 AV:N/AC:L/AT:P/PR:N/UI:N with VC/VI/VA:H, so unauthenticated network reach into a PHP unserialize() sink), while the independent assessment scores it high (CVSS 3.1 AV:N/AC:H/PR:N/UI:N, C/I/A:H) because full code execution additionally requires a suitable POP gadget chain to exist in the deployed version or its active plugins; absent such a chain, impact is limited to arbitrary object instantiation and magic-method side effects. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
No credit card · 7-day full trial
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No authentication required (PR:N): an unauthenticated attacker sends a crafted serialized PHP payload as plugin params via POST to the htsrv/call_plugin.php endpoint, which must be network-reachable (AV:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue by CVSS 4.0 (vendor score 9.2, AV:N/AC:L/AT:P/PR:N/UI:N with VC/VI/VA:H), reflecting unauthenticated network reach into a PHP unserialize() sink via POST to htsrv/call_plugin.php - a classic CWE-502 object injection. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upstream fixes are available as three b2evolution commits - https://github.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f9039509710b37ee2c4d, https://github.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55432fc74cd27 and https://github.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889f8100ebd1bb - so treat this as upstream fix available (PR/commit); a released patched version is not independently confirmed, and because the 6.7.8-7.2.5 line is end-of-life per https://b2evolution.net/news/2022/03/26/2022-update-eol, the durable fix is to migrate to a currently maintained b2evolution release or apply the referenced commits to your tree and retest. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every internet-facing b2evolution installation and determine which run versions 6.7.8 through 7.2.5 by checking the admin footer, version file, or repository records; apply the vendor-released patch referenced in the vendor advisory to all confirmed-vulnerable instances, and where patching cannot be completed immediately, take the affected site offline or block POST requests to /htsrv/call_plugin.php at the WAF or reverse proxy while restricting administrative paths to trusted IP ranges. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
In PHP versions 7.1.x below 7.1.33, 7.2.x below 7.2.24 and 7.3.x below 7.3.11 in certain configurations of FPM setup it
sapi/cgi/cgi_main.c in PHP before 5.3.12 and 5.4.x before 5.4.2, when configured as a CGI script (aka php-cgi), does not
(1) boardData102.php, (2) boardData103.php, (3) boardDataJP.php, (4) boardDataNA.php, and (5) boardDataWW.php in Netgear
The '/common/download_agent_installer.php' script in the Quest KACE System Management Appliance 8.0.318 is accessible by
ProjectSend versions prior to r1720 are affected by an improper authentication vulnerability. Rated critical severity (C
Roundcube Webmail contains a critical PHP object deserialization vulnerability (CVE-2025-49113, CVSS 9.9) that allows au
Util/PHP/eval-stdin.php in PHPUnit before 4.8.28 and 5.x before 5.6.3 allows remote attackers to execute arbitrary PHP c
Palo Alto Networks PAN-OS management web interface contains an authentication bypass allowing unauthenticated attackers
Nagios XI version xi-5.7.5 is affected by OS command injection. Rated high severity (CVSS 8.8), this vulnerability is re
Nagios XI version xi-5.7.5 is affected by OS command injection. Rated high severity (CVSS 8.8), this vulnerability is re
The get_referers function in /opt/ws/bin/sblistpack in Sophos Web Appliance before 3.7.9.1 and 3.8 before 3.8.1.1 allows
The Backup Migration plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 1
Same weakness CWE-502 – Deserialization of Untrusted Data
View allShare
External POC / Exploit Code
Leaving vuln.today