Description

Contributor Sensitive Data Exposure in Gutenberg Blocks by Kadence Blocks <= 3.7.8 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "4.3",
  "pubDate": "2026-08-06T15:17:22.730Z",
  "pubdate": "2026-08-06T15:17:22.730Z",
  "executiveSummary": "This vulnerability involves a contributor sensitive data exposure flaw within Gutenberg Blocks by Kadence Blocks versions <= 3.7.8. The security defect allows low-privileged users, specifically those with contributor-level access, to access and exfiltrate sensitive data that should be restricted to higher-privileged administrators or editors. The impact of this security issue includes the unauthorized disclosure of confidential configuration data, internal site details, or potentially credentials, thereby compromising the overall confidentiality posture of the WordPress instance. The affected product is the Kadence Blocks plugin running on WordPress. The risk implications are moderate to high, depending on the specific nature of the exposed data and the security hygiene of the target environment. The attacker capabilities required for successful exploitation involve authenticated access with at least contributor privileges on the WordPress site. There are no complex exploitation requirements beyond possessing a valid user account restricted to the contributor role, enabling malicious actors to abuse internal API endpoints or block rendering mechanisms designed within the plugin.",
  "technicalDetails": "The root cause of the vulnerability stems from improper access control enforcement within Gutenberg Blocks by Kadence Blocks <= 3.7.8. Specifically, the plugin fails to adequately validate user capabilities when processing requests or rendering specific block attributes and associated metadata. In WordPress architectures, the contributor role is heavily restricted from publishing content directly or accessing administrative configurations. However, due to insufficient authorization checks on backend handlers or data retrieval routines utilized by Kadence Blocks, a user assigned to the contributor role can bypass intended security boundaries.\nThe exploitation method relies on the attacker leveraging their authenticated contributor session to interact with vulnerable plugin functionalities or endpoints. The attack flow begins with the malicious contributor crafting or modifying a post utilizing specific Kadence Blocks components designed to query or store sensitive configuration parameters. By sending manipulated HTTP requests or examining the dynamic responses generated during the block rendering and preview lifecycle, the attacker can harvest information that is restricted by default WordPress capability checks.\nThe vulnerable component resides within the codebase handling block data processing, settings retrieval, or AJAX/REST API callbacks implemented by the Kadence Blocks plugin. Because the affected versions (<= 3.7.8) do not properly verify whether the initiating user possesses administrative capabilities such as manage_options or edit_others_posts before returning sensitive data payloads, unauthorized information disclosure occurs. The network exposure is constrained by the requirement of initial authentication, meaning an attacker must first provision or compromise a contributor-level account on the target WordPress installation.\nThe payload behavior involves the extraction of protected data structures returned in the server response, which may subsequently be leveraged by the attacker to plan further escalation vectors or compromise additional system components. Post-exploitation impact centers on unauthorized information disclosure, potentially exposing system paths, API keys, or administrative settings configured within the scope of the plugin, which can assist in subsequent privilege escalation or targeted attacks against the hosting infrastructure."
}