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CVE-2026-39923— Flarum < 1.8.16 Password Reset Token Expiry Bypass via POST /reset

Quick assessment

Affected
Flarum Flarum Framework
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.

Flarum framework是Flarum组织的一款组件框架。 Flarum framework 1.8.16之前版本存在加密问题漏洞，该漏洞源于密码重置令牌过期验证缺失，在SavePasswordController::handle()方法中调用PasswordToken::findOrFail()时未执行过期验证，可能导致未经身份验证的攻击者重用过期密码重置令牌并更改任意账户密码，从而获得经过身份验证的会话。

CVSS 8.1 · High EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1110 · Brute Force

Affected Version Matrix 1

VendorProduct Version RangeStatus
Flarum Flarum Framework < 1.8.16 affected
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I. Basic Information for CVE-2026-39923

Vulnerability Information
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Vulnerability Title
Flarum < 1.8.16 Password Reset Token Expiry Bypass via POST /reset
Source: CVE Program / CVE List V5
Vulnerability Description
Flarum before 1.8.16 contains a password reset token expiry bypass vulnerability that allows unauthenticated attackers to reuse expired password reset tokens by submitting them directly to the reset processing endpoint. The SavePasswordController::handle() method calls PasswordToken::findOrFail() without performing any expiry validation, allowing attackers to bypass the 24-hour token lifetime enforced only during form rendering and change any account's password to gain an authenticated session.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用已过期的密钥
Source: CVE Program / CVE List V5
Vulnerability Title
Flarum framework 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flarum framework是Flarum组织的一款组件框架。 Flarum framework 1.8.16之前版本存在加密问题漏洞，该漏洞源于密码重置令牌过期验证缺失，在SavePasswordController::handle()方法中调用PasswordToken::findOrFail()时未执行过期验证，可能导致未经身份验证的攻击者重用过期密码重置令牌并更改任意账户密码，从而获得经过身份验证的会话。
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
Flarum Flarum Framework 0 ~ 1.8.16 -

II. Public POCs for CVE-2026-39923

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8884 chars
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III. Intelligence Information for CVE-2026-39923

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Patches & Fixes for CVE-2026-39923 (3)

Vendor Advisories for CVE-2026-39923 (1)

IV. Related Vulnerabilities

Same product: Flarum Framework
Same vendor: Flarum
Same weakness: CWE-324

V. Comments for CVE-2026-39923

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