CVE-2026-72584 PUBLISHED

fastschema - TOCTOU Race Condition Bypasses OTP Attempt Limit in Account Recovery

Assigner: TuranSec
Reserved: 10.08.2026 Published: 10.08.2026 Updated: 10.08.2026

A time-of-check/time-of-use (TOCTOU) race condition in fastschema through v0.15.1 allows an unauthenticated remote attacker to bypass the OTP attempt limit on the account recovery flow, enabling brute-force attacks on 6-digit OTP codes.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS Score: 7.4

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	fastschema
Product	fastschema
Versions	Default: unknown affected from 0 to 0.15.1 (incl.)

Credits

Komiljon Ayubov finder

References

Product
Vulnerable File

Problem Types

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition CWE