CVE-2026-8981 — LOW (3.5) — White Hats Nepal

Vulnerability Description

The Custom Block Builder WordPress plugin before 4.3.0 does not consistently check the unfiltered_html capability across all paths that write to its block template code fields, allowing administrators on multisite installations (or single-site installs with DISALLOW_UNFILTERED_HTML defined) to inject arbitrary JavaScript that executes for any visitor of pages embedding the affected block.

CVSS Score

3.5

LOW

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Related Weaknesses (CWE)

CWE-79

References

https://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698/

FAQ

What is CVE-2026-8981?

CVE-2026-8981 is a vulnerability with a CVSS score of 3.5 (LOW). The Custom Block Builder WordPress plugin before 4.3.0 does not consistently check the unfiltered_html capability across all paths that write to its block template code fields, allowing administrator...

How severe is CVE-2026-8981?

CVE-2026-8981 has been rated LOW with a CVSS base score of 3.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-8981?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.