---
title: "CVE-2026-105133: Ahsay AhsayCBS Improper Authentication Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-105133/
description: "CVE-2026-105133 (Ahsay AhsayCBS): Exploited in the wild (CISA KEV). A vulnerability was detected in Ahsay AhsayCBS up to 10.3.2. This affects the function…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-10-04
date_modified: 2026-10-15
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-105133"
kev: true
cvss: 6.9
epss: 0.00854
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-105133: Ahsay AhsayCBS Improper Authentication Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Ahsay AhsayCBS. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-10-14, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-10-17 ; treat that as the outer limit, not the target.
- EPSS 0.9% , percentile 58: FIRST’s model estimates a 0.9% chance of exploitation activity in the next 30 days, higher than 58% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Editorial verdict: Act now. AhsayCBS: Exploited Pre-Auth RCE Chain in Backup Server — If you or your MSP run an AhsayCBS backup server, install the October 12 hotfix today and hunt for webshells: the chain is unauthenticated, runs as SYSTEM, is being exploited by several actors, and the August patch did not fix it.

## What it is

A vulnerability was detected in Ahsay AhsayCBS up to 10.3.2. 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 10.3.4 is able to mitigate this issue. It is recommended to upgrade the affected component.

## Affected products (CVE record)

- Ahsay AhsayCBS: 10.3.0, 10.3.1, 10.3.2

## Severity

- VulDB CVSS 4.0: 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:P`
- VulDB CVSS 3.1: 7.3 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C`
- VulDB CVSS 3.0: 7.3 `CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C`
- VulDB CVSS 2.0: 7.5 `AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C`

## Exploitation

- CISA KEV: added 2026-10-14; federal due date 2026-10-17. Known ransomware use: Unknown.
- CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.85% probability of exploitation activity in the next 30 days; percentile 58.

## Sources

- [ahsay.com](https://www.ahsay.com/en/support/help-centre/release-notes/cbs/v10.3.4)
- [Listed in CISA KEV notes (ahsay.com)](https://www.ahsay.com/en/company/announcements/patch-cve-105133-105134-update)
- [CVE.org record CVE-2026-105133](https://www.cve.org/CVERecord?id=CVE-2026-105133)
- [NVD entry CVE-2026-105133](https://nvd.nist.gov/vuln/detail/CVE-2026-105133)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-105133)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)
- [VDB-413350 | Ahsay AhsayCBS API ApiStructsAction.java checkSysPwd improper authentication](https://vuldb.com/vuln/413350)
- [VDB-413350 | CTI Indicators (IOB, IOC, IOA)](https://vuldb.com/vuln/413350/cti)
- [CVE-2026-105133 | CVE Analysis and Report](https://vuldb.com/cve/CVE-2026-105133)
- [Submit #942688 | Ahsay Systems Corporation Limited AhsayCBS 10.0.3 Authentication Bypass](https://vuldb.com/submit/942688)

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Source page: https://erroneo.us/security/cve/CVE-2026-105133/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt