CVE-2026-7465 brainstormforce CVE debrief

Who should care

WordPress site administrators using the Spectra Gutenberg Blocks plugin, security teams monitoring WordPress environments, and organizations with Contributor-level user access on their WordPress installations

Technical summary

The vulnerability stems from improper validation of block type registrations within the plugin's block initialization class. During sequential block rendering, the plugin invokes call_user_func() using render_callback values that can be attacker-controlled through crafted post content. A two-stage payload is required: the first block establishes a fake block type with the uagb/ prefix and specifies a malicious callback function, while the second block triggers the registered callback's execution. Because this occurs during a single page request, the attacker achieves server-side code execution without requiring additional requests after the malicious post is saved. The affected code paths in class-uagb-init-blocks.php at lines 330 and 335 handle block registration and callback invocation respectively.

Defensive priority

HIGH

Recommended defensive actions

• Update the Spectra Gutenberg Blocks plugin (Ultimate Addons for Gutenberg) to a version newer than 2.19.25 as soon as a patched release is available
• Review and restrict Contributor-level and higher user accounts to trusted personnel only
• Audit existing post content for unexpected uagb/-prefixed blocks that may indicate prior exploitation
• Implement Web Application Firewall rules to detect and block suspicious block registration patterns
• Monitor server logs for unusual call_user_func() invocations originating from the plugin's block rendering pipeline
• Consider temporarily disabling the plugin if patching is not immediately feasible and the functionality is not critical
• Apply principle of least privilege by reviewing whether users require Contributor, Author, Editor, or Administrator roles

Evidence notes

The vulnerability description and technical details are sourced from the NVD record and Wordfence security advisory. The affected code paths are identified in the plugin's class-uagb-init-blocks.php file at lines 330 and 335 in both the tagged 2.19.25 release and trunk versions. The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating network attack vector, low attack complexity, low privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.