Description

The Entries component in Brainstorm Force SureForms version, less than 2.1.3, does not enforce adequate limits on user-controlled form fields or submitted content during processing and rendering, which allows a remote attacker to exhaust server resources, prevent administrators from accessing the Entries interface, and trigger HTTP 500 errors via crafted form submissions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-08-18T16:17:02.647Z",
  "pubdate": "2026-08-18T16:17:02.647Z",
  "executiveSummary": "A resource exhaustion vulnerability exists in the Entries component of Brainstorm Force SureForms in versions less than 2.1.3.\nThe vulnerability arises due to the lack of adequate enforcement limits on user-controlled form fields and submitted content during the processing and rendering phases.\nA remote, unauthenticated attacker can exploit this flaw by submitting crafted form payloads designed to consume excessive server resources.\nSuccessful exploitation of this vulnerability results in denial of service conditions, specifically triggering HTTP 500 internal server errors and preventing authorized administrators from accessing the critical Entries management interface.\nThe risk implication is service disruption and administrative lockout, impacting the availability of the WordPress application and administrative oversight.\nThe attack vector is network-based, leveraging standard form submission endpoints exposed by the plugin without requiring prior authentication or privileged access.",
  "technicalDetails": "The root cause of the vulnerability lies in the improper input validation and unbounded processing of user-controlled form fields within the Entries component of Brainstorm Force SureForms versions less than 2.1.3.\nDuring the form submission and subsequent backend rendering of the entries interface, the application fails to enforce strict size, length, or structural limits on the incoming data payload.\nThe vulnerable component handles rendering operations synchronously or inefficiently when parsing these oversized or maliciously crafted field inputs.\nThe attack flow proceeds as follows: First, a remote attacker crafts a malicious HTTP POST request targeting the SureForms submission endpoint, embedding excessively large, deeply nested, or computationally expensive structures within user-controlled form fields.\nSecond, the server accepts and processes the payload without imposing resource thresholds or sanitization limits.\nThird, when the backend attempts to process, store, or subsequently render these entries within the administrative dashboard, it consumes disproportionate CPU, memory, and database resources.\nFinally, this resource exhaustion triggers unhandled exceptions resulting in HTTP 500 Internal Server Errors.\nConcurrently, the resource starvation locks out administrative users attempting to access the Entries interface, achieving a localized denial of service.\nNetwork exposure is universal via the public-facing form submission mechanisms of the plugin, requiring no privileges or authentication to initiate the attack."
}