CVE-2026-22216 wpDiscuz before 7.6.47 - No Rate Limiting on Subscription Endpoints with LIKE Wildcard Bypass
Unauthenticated attackers can spam arbitrary email addresses with post notifications by exploiting missing rate limits and wildcard bypasses in wpDiscuz.
- 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-2026-22216?
CVE-2026-22216 is a medium-severity denial of service vulnerability in gVectors wpDiscuz, published on 13 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
wpDiscuz before 7.6.47 contains a missing rate limiting vulnerability that allows unauthenticated attackers to subscribe arbitrary email addresses to post notifications by sending POST requests to the wpdAddSubscription handler in class.WpdiscuzHelperAjax.php. Attackers can exploit LIKE wildcard characters in the subscription query to match multiple email addresses and generate unwanted notification emails to victim accounts.
Weakness: CWE-799
Which versions are affected by CVE-2026-22216?
It affects 1 product.
Products include Gvectors Wpdiscuz.
How do I fix CVE-2026-22216?
No fix has been published for CVE-2026-22216 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-22216 being exploited?
There is no known exploitation of CVE-2026-22216 in the wild and no public exploit code.
Other vulnerabilities in gVectors wpDiscuz
- CVE-2020-24186 File upload in n/a
- CVE-2024-9488 Comments – wpDiscuz <= 7.6.24 - Authentication Bypass via WordPress.com OAuth provider
- CVE-2020-13640 SQL injection in n/a
- CVE-2026-22193 wpDiscuz before 7.6.47 - SQL Injection in getAllSubscriptions()
- CVE-2026-22192 Voltronic Power SNMP Web Pro 1.1 Authentication Bypass via localStorage
Sources
Also known as GHSA-9j2r-2287-24hf.