CVE-2026-75575: Rocket.Chat Missing DDP Rate Limit on the sendForgotPasswordEmail Meteor Method

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-25 · updated 2026-10-12
Weakness: CWE-204

Description

Rocket.Chat exposes the sendForgotPasswordEmail Meteor method without a DDP rate limit, so an unauthenticated caller may invoke it as often as it likes. The method is reachable over DDP and over the HTTP route POST /api/v1/method.callAnon/sendForgotPasswordEmail, and it triggers a password reset message for any address that matches an account. With no DDPRateLimiter rule registered for it, a caller can drive an unbounded volume of reset mail at a chosen address from the deployment's own mail sender, and can probe addresses at scale: the method answers true for an address with no account and for a successful send, but false when the address belongs to an account that authenticates through an external provider and Accounts_AllowPasswordChangeForOAuthUsers is off, so repeated calls distinguish that class of account. Later versions register a rule permitting ten calls per minute per client address.

Affected products

Rocket.Chat: before 7.10.15; from 8.0.0 before 8.1.8; from 8.2.0 before 8.2.8; from 8.3.0 before 8.3.8; from 8.4.0 before 8.4.6; from 8.5.0 before 8.5.3 — fixed in 7.10.15, 8.1.8, 8.2.8, 8.3.8, 8.4.6, 8.5.3

How to fix

Upgrade to a fixed version: Rocket.Chat 7.10.15, 8.1.8, 8.2.8, 8.3.8. Check the vendor advisory for mitigations.

References

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