# CVE-2026-105133: Ahsay AhsayCBS Improper Authentication

> Attackers can bypass authentication in the AhsayCBS API by manipulating the random argument, allowing unauthorized access.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:A`)
- **Exploited in the wild:** Yes, since 14 Oct 2026 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Oct 2026
- **Updated:** 26 Oct 2026
- **Also known as:** GHSA-fp2j-3cmp-828j

## What is CVE-2026-105133?

CVE-2026-105133 is a medium-severity authentication bypass vulnerability in AhsayCBS, published on 4 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was detected in Ahsay AhsayCBS up to 9.15.2.69/10.3.4.44. This affects the function checkSysPwd of the file com/ahsay/obs/api/ApiStructsAction.java of the component API. Performing a manipulation of the argument random results in improper authentication. It is possible to initiate the attack remotely. The exploit is now public and may be used. Upgrading to version 9.15.2.70 and 10.3.4.45 is able to mitigate this issue. It is recommended to upgrade the affected component. The initial patch did not fix the security vulnerability properly. An update of the CVE entry to reflect this became necessary.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-105133?

It affects 1 product.


Products: Ahsay Cloud Backup Suite.

## How do I fix CVE-2026-105133?

No fix has been published for CVE-2026-105133 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 17 Oct 2026.

## Is CVE-2026-105133 being exploited?

Yes. Attackers have exploited CVE-2026-105133 in the wild since at least 14 Oct 2026.

Public exploit code:

- A proof of concept exploit for CVE-2026-105133 and CVE-2026-105134 affecting AhsayCBS (github_poc): https://github.com/horizon3ai/AhsayCBS-Auth-Bypass-RCE
- AhsayCBS - JSON API Authentication Bypass (nuclei): http/cves/2026/CVE-2026-105133.yaml

## Other vulnerabilities in AhsayCBS

- [CVE-2026-105134](https://insights.sbomify.com/CVE-2026-105134/): Ahsay AhsayCBS Command Injection (critical 10.0, exploited in the wild)
- [CVE-2020-5846](https://insights.sbomify.com/CVE-2020-5846/): File upload in n/a (high 8.8)
- [CVE-2019-10267](https://insights.sbomify.com/CVE-2019-10267/): File upload in n/a (high 8.8)
- [CVE-2019-10265](https://insights.sbomify.com/CVE-2019-10265/): Path traversal in n/a (high 7.5)
- [CVE-2019-10266](https://insights.sbomify.com/CVE-2019-10266/): XML external entity in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-105133 and fix it if it is affected.

What it is: CVE-2026-105133 is a medium-severity authentication bypass vulnerability in AhsayCBS, published on 4 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2026-105133 in the wild since at least 14 Oct 2026.

Affected product: AhsayCBS. 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-2026-105133/ (Markdown: https://insights.sbomify.com/CVE-2026-105133/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-105133
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-105133
- OSV: https://osv.dev/vulnerability/CVE-2026-105133

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-105133/
Summaries are generated and may contain mistakes; the official description above is the record.