CVE-2026-73529 Plainpad Missing Rate Limiting via POST /v1/sessions
Unauthenticated attackers can exhaust CPU resources and bypass login protections in Plainpad due to missing rate limiting on the session endpoint.
- 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-2026-73529?
CVE-2026-73529 is a medium-severity denial of service vulnerability in alextselegidis plainpad, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Plainpad through 1.1.1, fixed in commit d3823fc, contains a missing rate limiting vulnerability that allows unauthenticated attackers to send unbounded login requests to the POST /v1/sessions endpoint due to dead code in App\Http\Kernel.php that is never instantiated under the Laravel 11+ skeleton, leaving the API throttle configuration unattached to any route. Attackers can exploit this by sending unlimited credential attempts with no lockout or CAPTCHA enforcement, and additionally trigger CPU exhaustion by forcing repeated bcrypt comparisons on each request.
Weakness: CWE-307
Which versions are affected by CVE-2026-73529?
How do I fix CVE-2026-73529?
No fix has been published for CVE-2026-73529 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-2026-73529 being exploited?
There is no known exploitation of CVE-2026-73529 in the wild and no public exploit code.
Sources
Also known as GHSA-9fxw-r4jg-3hq3.