Security Digest · Vulnerability record · Known exploited
CVE-2026-105133: Ahsay AhsayCBS Improper Authentication Vulnerability
Exploited in the wild (CISA KEV). A vulnerability was detected in Ahsay AhsayCBS up to 10.3.2.
CISA KEV · added 2026-10-14 CVSS 6.9 Medium EPSS 0.9% · p58 Act now
Should you act?
Exploited: patch now if you run it
CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- 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.
CISA’s summary
Ahsay AhsayCBS contains an improper authentication vulnerability that could allow a remote attacker to bypass authentication via manipulation of the random parameter in the API component’s checkSysPwd function. This vulnerability can be chained with CVE-2026-105134.
Weakness type: CWE-287.
Product: Ahsay AhsayCBS · Assigned by: VulDB · Published: 2026-10-04
Affected and fixed versions
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| Ahsay | AhsayCBS | 10.3.0, 10.3.1, 10.3.2 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| VulDB | 4.0 | 6.9 Medium | 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 | 3.1 | 7.3 High | 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 | 3.0 | 7.3 High | 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 | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Attack requirements: none
- Privileges required: none (no login)
- User interaction: none
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- 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.
Timeline
- — CVE record published by VulDB
- — erroneo.us brief: AhsayCBS: Exploited Pre-Auth RCE Chain in Backup Server
- — Added to CISA’s Known Exploited Vulnerabilities catalog
- — CVE record last updated
- — CISA remediation deadline for US federal agencies
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- ahsay.com ahsay.com
- Listed in CISA KEV notes (ahsay.com) ahsay.com
Vulnerability records
- CVE.org record CVE-2026-105133 cve.org
- NVD entry CVE-2026-105133 nvd.nist.gov
Government
- CISA Known Exploited Vulnerabilities catalog entry cisa.gov
- Listed in CISA KEV notes (cisa.gov) cisa.gov
- Listed in CISA KEV notes (cisa.gov) cisa.gov
Other references from the CVE record and advisory
- VDB-413350 | Ahsay AhsayCBS API ApiStructsAction.java checkSysPwd improper authentication vuldb.com
- VDB-413350 | CTI Indicators (IOB, IOC, IOA) vuldb.com
- CVE-2026-105133 | CVE Analysis and Report vuldb.com
- Submit #942688 | Ahsay Systems Corporation Limited AhsayCBS 10.0.3 Authentication Bypass vuldb.com
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