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URL: https://nvd.nist.gov/vuln/detail/CVE-2023-40033

⇱ NVD - CVE-2023-40033

  1. Vulnerabilities

CVE-2023-40033 Detail

Modified After Enrichment

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/flarum/framework/commit/d1059c1cc79fe61f9538f3da55e8f42abbede570 CVE, GitHub, Inc. Patch 
https://github.com/flarum/framework/security/advisories/GHSA-67c6-q4j4-hccg CVE, GitHub, Inc. Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-918 Server-Side Request Forgery (SSRF) GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Denotes Vulnerable Software
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Change History

5 change records found show changes

CVE Modified by CISA-ADP 6/17/2026 2:15:51 AM

Action Type Old Value New Value
Added SSVC 
{"timestamp":"2024-10-02T15:56:22.975991Z","id":"CVE-2023-40033","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

CVE Modified by GitHub, Inc. 6/17/2026 2:15:51 AM

Action Type Old Value New Value
Added Affected 
[{"vendor":"flarum","product":"framework","versions":[{"version":"< 1.8.0","status":"affected"}]}]

CVE Modified by CVE 11/21/2024 3:18:33 AM

Action Type Old Value New Value
Added Reference 
https://github.com/flarum/framework/commit/d1059c1cc79fe61f9538f3da55e8f42abbede570
Added Reference 
https://github.com/flarum/framework/security/advisories/GHSA-67c6-q4j4-hccg

CVE Modified by GitHub, Inc. 5/14/2024 9:36:14 AM

Action Type Old Value New Value

Initial Analysis by NIST 8/25/2023 2:10:15 PM

Action Type Old Value New Value
Added CVSS V3.1 
NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Added CPE Configuration 
OR
 *cpe:2.3:a:flarum:flarum:*:*:*:*:*:*:*:* versions up to (excluding) 1.8.0
Changed Reference Type 
https://github.com/flarum/framework/commit/d1059c1cc79fe61f9538f3da55e8f42abbede570 No Types Assigned


 
https://github.com/flarum/framework/commit/d1059c1cc79fe61f9538f3da55e8f42abbede570 Patch
Changed Reference Type 
https://github.com/flarum/framework/security/advisories/GHSA-67c6-q4j4-hccg No Types Assigned


 
https://github.com/flarum/framework/security/advisories/GHSA-67c6-q4j4-hccg Vendor Advisory

Quick Info

CVE Dictionary Entry:
CVE-2023-40033
NVD Published Date:
08/16/2023
NVD Last Modified:
06/17/2026
Source:
GitHub, Inc.