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TI-2026-53670 Aliases CVE-2026-76834GHSA-2vrr-cgr4-gfmm

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

Priority MEDIUM 43CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-502.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00847 58th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
B2Evolutionb2evolution CMS6.7.8 – 7.2.5—No fix listedCNA
  • b2evolution CMS VendorB2Evolution Affected 6.7.8 – 7.2.5 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-76834
  2. 2026-10-03 Alias added: GHSA-2vrr-cgr4-gfmm

References

Patch 3

Advisory 1

Other 4

  • TI-2021-22416 b2evolution 7.2.2 - 'edit account details' Cross-Site Request Forgery (CSRF) CVSS 4.0MEDIUM 6.9
  • TI-2022-21660 In b2evolution 7.2.5, if configured with admins_can_manipulate_sensitive_files, arbitrary… CVSS 3.1HIGH 7.2
  • TI-2022-12996 An authorization bypass in b2evolution allows remote, unauthenticated attackers to… CVSS 3.1CRITICAL 9.1
  • TI-2017-14642 b2evolution version 6.6.0 - 6.8.10 is vulnerable to input validation (backslash and… CVSS 3.0CRITICAL 9.8
  • TI-2016-07299 b2evolution 6.7.6 suffer from an Object Injection vulnerability in /htsrv/call_plugin.php. CVSS 3.0CRITICAL 9.8
  • TI-2021-11721 b2evolution CMS v7.2.3 was discovered to contain a SQL injection vulnerability via the… CVSS 3.1CRITICAL 9.8
See all 30 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences