# CVE-2026-4831: kalcaddle kodbox Password-protected Share auth.class.php can improper authentication

> Remote attackers can bypass authentication in password-protected shares to access or modify files, requiring high complexity and specific configurations.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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:** 26 Mar 2026
- **Updated:** 26 Mar 2026
- **Also known as:** GHSA-8hrp-4v5x-m9q3

## What is CVE-2026-4831?

CVE-2026-4831 is a medium-severity authentication bypass vulnerability in kalcaddle kodbox, published on 26 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A security flaw has been discovered in kalcaddle kodbox 1.64. Impacted is the function can of the file /workspace/source-code/app/controller/explorer/auth.class.php of the component Password-protected Share Handler. Performing a manipulation results in improper authentication. The attack is possible to be carried out remotely. The complexity of an attack is rather high. The exploitability is considered difficult. The exploit has been released to the public and may be used for attacks. 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-2026-4831?


## How do I fix CVE-2026-4831?

No fix has been published for CVE-2026-4831 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4831 being exploited?

There is no known exploitation of CVE-2026-4831 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4831 and fix it if it is affected.

What it is: CVE-2026-4831 is a medium-severity authentication bypass vulnerability in kalcaddle kodbox, published on 26 Mar 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-2026-4831 in the wild and no public exploit code.

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-2026-4831/ (Markdown: https://insights.sbomify.com/CVE-2026-4831/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4831
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4831
- OSV: https://osv.dev/vulnerability/CVE-2026-4831

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-4831/
Summaries are generated and may contain mistakes; the official description above is the record.