# CVE-2026-8499: Auth bypass in Helpfulcrowd Product Reviews

> Unauthenticated attackers can bypass authorization via type juggling to arbitrarily modify plugin settings in Helpfulcrowd Product Reviews.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Jun 2026
- **Updated:** 9 Jun 2026
- **Also known as:** GHSA-q2xw-j7qq-rpp9

## What is CVE-2026-8499?

CVE-2026-8499 is a medium-severity authentication bypass vulnerability in Helpfulcrowd Product Reviews, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Helpfulcrowd Product Reviews plugin for WordPress is vulnerable to Authorization Bypass via PHP Type Juggling in versions up to, and including, 1.2.9. This is due to the `helpfulcrowd_validate_token()` function using a loose comparison operator (`!=`) instead of a strict comparison (`!==`) when validating the `token` parameter, while the corresponding REST route `/wp-json/helpfulcrowd/v1/update-settings` is registered with a `permission_callback` of `__return_true`, making it reachable by unauthenticated users; submitting a JSON boolean `true` as the `token` value causes PHP's loose comparison to evaluate as equal to the non-empty base64-encoded secret string, bypassing the check entirely. This makes it possible for unauthenticated attackers to invoke `helpfulcrowd_settings_endpoint()` and write arbitrary attacker-controlled key-value pairs directly into the `helpfulcrowd_options` WordPress database option via `update_option()` without any sanitization or allowlist filtering, enabling full unauthenticated modification of the plugin's stored configuration.

Weakness: CWE-843 (Access of Resource Using Incompatible Type)

## Which versions are affected by CVE-2026-8499?


## How do I fix CVE-2026-8499?

No fix has been published for CVE-2026-8499 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-8499 being exploited?

There is no known exploitation of CVE-2026-8499 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8499 and fix it if it is affected.

What it is: CVE-2026-8499 is a medium-severity authentication bypass vulnerability in Helpfulcrowd Product Reviews, published on 9 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-8499 in the wild and no public exploit code.

Affected product: Helpfulcrowd Product Reviews. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-8499/ (Markdown: https://insights.sbomify.com/CVE-2026-8499/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8499
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8499
- OSV: https://osv.dev/vulnerability/CVE-2026-8499

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-8499/
Summaries are generated and may contain mistakes; the official description above is the record.