CVE-2026-39923

Flarum < 1.8.16 Password Reset Token Expiry Bypass via POST /reset

Published: Aug 5, 2026Updated: Sep 9, 2026 Sources: CVE List NVDCWE-324

8.1HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

Open in CVSS calculator →

Weaknesses

CWE-324

Affected Products

Flarum

oss-project·SG

Flarum FrameworkOn-prem

Web & CMS Plugins / forum-wiki

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Is your org exposed to CVE-2026-39923?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

References

https://github.com/flarum/framework/releases/tag/v1.8.16

github.com

https://github.com/flarum/framework/pull/4545

github.com

https://github.com/flarum/framework/commit/2803058d0f9dc38252326070b46d4484fe5a857d

github.com

and 1 more references View all →

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-39923 and every CVE in our database. Create a free account — no credit card required.

Create Free Account

Plain-language analysis

Impact assessment and exploitation scenario in plain English

Attack graph visualization

Interactive attack path and kill chain mapping

Exploit details & PoC links

ExploitDB, Metasploit, GitHub PoCs with direct links

Nuclei scanner templates

Ready-to-use vulnerability scanner templates

Full remediation guide

Patch instructions, workarounds, and compliance impact

Interactive AI chat

Ask questions about this vulnerability in natural language

Related vulnerabilities

Semantically similar CVEs and attack patterns

REST API & MCP access

Integrate vulnerability data into your workflows