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CVE-2024-21641— Flarum's Logout Route allows open redirects

Quick assessment

Affected
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是Flarum社区的一套开源的论坛系统。 Flarum 1.8.5 之前版本存在输入验证错误漏洞，该漏洞源于 logout路由包含一个重定向参数，允许任何第三方将用户从受信任域重定向到任何链接。

CVSS 6.5 · Medium EPSS 1.07% · P63

Public Exploits 1

Nuclei · 1 CVE-2024-21641.yaml [template]

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2024-21641

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Flarum's Logout Route allows open redirects
Source: CVE Program / CVE List V5
Vulnerability Description
Flarum is open source discussion platform software. Prior to version 1.8.5, the Flarum `/logout` route includes a redirect parameter that allows any third party to redirect users from a (trusted) domain of the Flarum installation to redirect to any link. For logged-in users, the logout must be confirmed. Guests are immediately redirected. This could be used by spammers to redirect to a web address using a trusted domain of a running Flarum installation. The vulnerability has been fixed and published as flarum/core v1.8.5. As a workaround, some extensions modifying the logout route can remedy this issue if their implementation is safe.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Flarum 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flarum是Flarum社区的一套开源的论坛系统。 Flarum 1.8.5 之前版本存在输入验证错误漏洞，该漏洞源于 logout路由包含一个重定向参数，允许任何第三方将用户从受信任域重定向到任何链接。
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 framework < 1.8.5 -

II. Public POCs for CVE-2024-21641

# POC Description Source Link Shenlong Link
1 Flarum is open source discussion platform software. Prior to version 1.8.5, the Flarum `/logout` route includes a redirect parameter that allows any third party to redirect users from a (trusted) domain of the Flarum installation to redirect to any link. For logged-in users, the logout must be confirmed. Guests are immediately redirected. This could be used by spammers to redirect to a web address using a trusted domain of a running Flarum installation. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2024/CVE-2024-21641.yaml POC Details
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III. Intelligence Information for CVE-2024-21641

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Patches & Fixes for CVE-2024-21641 (2)

Vendor Advisories for CVE-2024-21641 (1)

IV. Related Vulnerabilities

Same product: framework
Same vendor: flarum
Same weakness: CWE-601

V. Comments for CVE-2024-21641

Anonymous User
2026-06-25 22:43:08

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