# CVE-2026-4592: kalcaddle kodbox Password Login index.class.php tfaVerify improper authentication

> Improper authentication in kodbox password login allows remote attackers to bypass two-factor verification and potentially take over accounts.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Mar 2026
- **Updated:** 23 Mar 2026
- **Also known as:** GHSA-8f63-r6mw-5h4q

## What is CVE-2026-4592?

CVE-2026-4592 is a medium-severity authentication bypass vulnerability in kalcaddle kodbox, published on 23 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A security vulnerability has been detected in kalcaddle kodbox 1.64. This impacts the function loginAfter/tfaVerify of the file /workspace/source-code/plugins/client/controller/tfa/index.class.php of the component Password Login. The manipulation leads to improper authentication. The attack is possible to be carried out remotely. The attack is considered to have high complexity. The exploitability is said to be difficult. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-4592?


## How do I fix CVE-2026-4592?

No fix has been published for CVE-2026-4592 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4592 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4592 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4592 and fix it if it is affected.

What it is: CVE-2026-4592 is a medium-severity authentication bypass vulnerability in kalcaddle kodbox, published on 23 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4592 exists.

Affected product: kalcaddle kodbox. 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-2026-4592/ (Markdown: https://insights.sbomify.com/CVE-2026-4592/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4592
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4592
- OSV: https://osv.dev/vulnerability/CVE-2026-4592

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4592/
Summaries are generated and may contain mistakes; the official description above is the record.