CVE-2026-89411 Paymattic < 4.6.26 - Unauthenticated Payment Bypass via Unbound Stripe PaymentIntent
Unauthenticated attackers can mark arbitrary pending orders as paid by confirming a smaller Stripe payment, bypassing payment verification in Paymattic.
- 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-2026-89411?
CVE-2026-89411 is a medium-severity vulnerability in Unknown Paymattic, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Paymattic WordPress plugin from 4.6.20 before 4.6.26 does not verify that a confirmed Stripe payment belongs to the order it is applied to, allowing unauthenticated users to mark an arbitrary pending order as paid by confirming a smaller payment of their own against it.
Weakness: CWE-345
Which versions are affected by CVE-2026-89411?
How do I fix CVE-2026-89411?
No fix has been published for CVE-2026-89411 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-89411 being exploited?
There is no known exploitation of CVE-2026-89411 in the wild and no public exploit code.
Sources
Also known as GHSA-xhxc-69hm-mqvf.