CVE-2026-112103: Improper Certificate Validation in f3-factory fatfree-core
Description
A vulnerability has been found in f3-factory fatfree-core up to 3.9.2. This vulnerability affects the function _curl of the file web.php of the component HTTP Client. Such manipulation leads to improper certificate validation. The attack may be performed from remote. Attacks of this nature are highly complex. It is stated that the exploitability is difficult. Upgrading to version 3.9.3 is able to resolve this issue. The name of the patch is a2c755c8dc9ad0eb7d5fd261b09aff90f649433c. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
CVSS v4.0
Score 6.3medium
Affected software
f3-factory
fatfree-core
pkg:github/f3-factory/fatfree-corecpe:2.3:a:f3-factory:fatfree-core:*:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-112103 affects the fatfree-core component of f3-factory up to version 3.9.2. It is caused by improper certificate validation in the _curl function of the HTTP Client component (web.php file). This weakness could allow an attacker to bypass certificate validation checks during HTTPS connections. The vendor has released a fix in version 3.9.3, identified by patch a2c755c8dc9ad0eb7d5fd261b09aff90f649433c, addressing this issue.
Potential Impact
Improper certificate validation can lead to man-in-the-middle attacks or interception of HTTPS traffic, potentially compromising data confidentiality and integrity. However, the exploitability is rated as difficult, and no known exploits are reported in the wild. The impact is therefore moderate but should be addressed to maintain secure communications.
Mitigation Recommendations
Upgrade fatfree-core to version 3.9.3 or later, which contains an official fix for this vulnerability. Applying this update eliminates the improper certificate validation issue. No additional mitigation is required if the upgrade is applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-10-18T17:46:56.753Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ad5f2162cdf04f656419db0
Added to database: 10/19/2026, 10:33:58 UTC
Last enriched: 10/19/2026, 10:48:52 UTC
Last updated: 10/19/2026, 13:19:09 UTC
Views: 8
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