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CVE-2026-72584— fastschema - TOCTOU Race Condition Bypasses OTP Attempt Limit in Account Recovery

Quick assessment

Affected
fastschema fastschema
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FastSchema是fastschema组织的一款开发框架。 FastSchema v0.15.1及之前版本存在竞争条件问题漏洞，该漏洞源于TOCTOU竞争条件，pkg/auth/local.go文件中的verifyOTPSession函数以非原子操作读取并递增尝试计数器，可能导致未经身份验证的远程攻击者绕过账户恢复流程中的OTP尝试限制，对6位OTP代码进行暴力破解攻击。

CVSS 7.4 · High EPSS 0.39% · P33

Possible ATT&CK Techniques 1 AI

T1110.004 · Credential Stuffing

Affected Version Matrix 1

VendorProduct Version RangeStatus
fastschema fastschema ≤ 0.15.1 affected
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I. Basic Information for CVE-2026-72584

Vulnerability Information
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Vulnerability Title
fastschema - TOCTOU Race Condition Bypasses OTP Attempt Limit in Account Recovery
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
FastSchema 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FastSchema是fastschema组织的一款开发框架。 FastSchema v0.15.1及之前版本存在竞争条件问题漏洞，该漏洞源于TOCTOU竞争条件，pkg/auth/local.go文件中的verifyOTPSession函数以非原子操作读取并递增尝试计数器，可能导致未经身份验证的远程攻击者绕过账户恢复流程中的OTP尝试限制，对6位OTP代码进行暴力破解攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fastschema fastschema 0 ~ 0.15.1 -

II. Public POCs for CVE-2026-72584

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 11928 chars
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III. Intelligence Information for CVE-2026-72584

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Vendor Pages for CVE-2026-72584 (1)

Same Patch Batch · fastschema · 2026-08-10 · 3 CVEs total

CVE-2026-72582 7.5 HIGH fastschema - Unauthenticated NULL Pointer Dereference DoS in Account Recovery Endpoint
CVE-2026-72583 5.4 MEDIUM fastschema - Stored Cross-Site Scripting via MIME Type Bypass in File Upload

IV. Related Vulnerabilities

Same product: fastschema
Same vendor: fastschema
Same weakness: CWE-367