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CVE-2023-40033— Server-Side Request Forgery via Avatar upload in flarum

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 1.8.0之前版本存在代码问题漏洞，该漏洞源于允许攻击者通过 SSRF 攻击泄露服务器上的任何文件，即使在是Flarum 论坛上基本用户帐户，攻击者利用该漏洞可以通过上传包含 URL 的文件欺骗 MIME 类型，操纵应用程序执行意外的操作。

CVSS 7.1 · High EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-40033

Vulnerability Information
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Vulnerability Title
Server-Side Request Forgery via Avatar upload in flarum
Source: CVE Program / CVE List V5
Vulnerability Description
Flarum is an open source forum software. Flarum is affected by a vulnerability that allows an attacker to conduct a Blind Server-Side Request Forgery (SSRF) attack or disclose any file on the server, even with a basic user account on any Flarum forum. By uploading a file containing a URL and spoofing the MIME type, an attacker can manipulate the application to execute unintended actions. The vulnerability is due to the behavior of the `intervention/image` package, which attempts to interpret the supplied file contents as a URL, which then fetches its contents. This allows an attacker to exploit the vulnerability to perform SSRF attacks, disclose local file contents, or conduct a blind oracle attack. This has been patched in Flarum version 1.8.0. Users are advised to upgrade. Users unable to upgrade may disable PHP's `allow_url_fopen` which will prevent the fetching of external files via URLs as a temporary workaround for the SSRF aspect of the vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Flarum 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flarum是Flarum社区的一套开源的论坛系统。 Flarum 1.8.0之前版本存在代码问题漏洞，该漏洞源于允许攻击者通过 SSRF 攻击泄露服务器上的任何文件，即使在是Flarum 论坛上基本用户帐户，攻击者利用该漏洞可以通过上传包含 URL 的文件欺骗 MIME 类型，操纵应用程序执行意外的操作。
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 < 1.8.0 -

II. Public POCs for CVE-2023-40033

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6850 chars
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III. Intelligence Information for CVE-2023-40033

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Patches & Fixes for CVE-2023-40033 (1)

Vendor Advisories for CVE-2023-40033 (1)

IV. Related Vulnerabilities

Same product: framework
Same vendor: flarum
Same weakness: CWE-918

V. Comments for CVE-2023-40033

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