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.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
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.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-8499 being exploited?
There is no known exploitation of CVE-2026-8499 in the wild and no public exploit code.
Sources
Also known as GHSA-q2xw-j7qq-rpp9.