CVE-2026-76834

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.84% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 57.8% of scored records. A rank, not a probability.

NVD base score

9.2 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Deferred. NVD last modified this record on 2026-09-23.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-17 15:16Z1 MO AGO

Last updated

2026-09-18 18:04Z1 MO AGO

Reserved

2026-08-19

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

Critical (CVSS 9.2)

CNA CVSS vector

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

Weaknesses

• CWE-502Deserialization of Untrusted DataBase

Data version

5.2

Document digest

b532d39b7b10d7ae26802943a9f2c2b4af48689f4544670a012b380ebc556ea8

• gist.github.comhttps://gist.github.com/axg11/3e29501c33f6e1e05ac2a00107afd64etechnical-description
• github.comhttps://github.com/b2evolution/b2evolution/blob/7.2.5/inc/_core/_param.funcs.php#L2860technical-description
• github.comhttps://github.com/b2evolution/b2evolution/blob/7.2.5/htsrv/call_plugin.php#L49technical-description
• github.comIncomplete fix for CVE-2016-8901 (1 of 2)https://github.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f9039509710b37ee2c4dpatch
• github.comIncomplete fix for CVE-2016-8901 (2 of 2)https://github.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55432fc74cd27patch
• github.comIntroduces the flawed regular expression, first released in 6.7.8https://github.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889f8100ebd1bbtechnical-descriptionpatch
• b2evolution.netb2evolution CMS end-of-life announcementhttps://b2evolution.net/news/2022/03/26/2022-update-eolvendor-advisory
• github.comhttps://github.com/b2evolution/b2evolutionproduct
• www.vulncheck.comVulnCheck Advisory: b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Keyhttps://www.vulncheck.com/advisories/b2evolution-cms-6.7.8-through-7.2.5-object-injection-via-negative-integer-array-keythird-party-advisory