# CVE-2026-112103: f3-factory fatfree-core HTTP Client web.php _curl certificate validation

> Improper certificate validation in the HTTP client allows attackers to bypass security checks, potentially enabling man-in-the-middle attacks.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Oct 2026
- **Updated:** 19 Oct 2026
- **Also known as:** GHSA-93rm-6gqp-hr45

## What is CVE-2026-112103?

CVE-2026-112103 is a medium-severity vulnerability in f3-factory fatfree-core, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-295 (Improper Certificate Validation), CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-112103?


## How do I fix CVE-2026-112103?

No fix has been published for CVE-2026-112103 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-112103 being exploited?

There is no known exploitation of CVE-2026-112103 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-112103 and fix it if it is affected.

What it is: CVE-2026-112103 is a medium-severity vulnerability in f3-factory fatfree-core, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-112103 in the wild and no public exploit code.

Affected product: f3-factory fatfree-core. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-112103/ (Markdown: https://insights.sbomify.com/CVE-2026-112103/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-112103
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-112103
- OSV: https://osv.dev/vulnerability/CVE-2026-112103

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-112103/
Summaries are generated and may contain mistakes; the official description above is the record.