CVE-2026-105133: AhsayCBS API authentication bypass (checkSysPwd)

Exploited in the wild Medium 6.9 EPSS 79.5%

AhsayCBS up to 9.15.2.69 and 10.3.4.44 has an improper authentication flaw in checkSysPwd (com/ahsay/obs/api/ApiStructsAction.java): manipulating the 'random' argument lets a remote attacker bypass authentication. Huntress observed the two flaws chained in the wild from 2026-10-07 to drop JSP web shells and XMRig miners; Ahsay's first patches (9.15.2.59 and 10.3.4.0) were incomplete and the full fix is the 9.15.2.70 and 10.3.4.45 hotfixes. CISA added both CVEs to the Known Exploited Vulnerabilities catalog on 2026-10-14.

CVE-2026-105133CVE identifier
6.9CVSS 4.0 base score (medium)
2026-10-14added to CISA's exploited list (US federal deadline 2026-10-17)
79.5%EPSS: chance of exploitation in the next 30 days (higher than 100% of CVEs)
2026-10-04published

What do these terms mean? CVE · CVSS score · exploited (KEV) · EPSS · backported fix · all terms

What to do now

Check whether you run the affected software and which version (commands below).
Install the fixed version for your system: see “Patch it” below.
Ahsay instructs partners to reboot the server after applying the hotfix.
If you cannot patch today, apply the temporary mitigation below and patch as soon as possible.
Because this flaw is being exploited, also check the server for signs of compromise.

Affected and fixed versions

Affected:

AhsayCBS v7, v8 and v9 up to 9.15.2.69
AhsayCBS v10 up to 10.3.4.44

Fixed in:

AhsayCBS 9.15.2.70 hotfix (for v7, v8, v9)
AhsayCBS 10.3.4.45 hotfix (for v10)

Patch it

Use the commands for your system. Distribution packages often keep an older version number with the fix backported, so compare with the fixed package versions in the table below, not only with the upstream version.

Built from source

# Download the hotfix from the Ahsay partner portal (login required):
#   v10:          https://www.ahsay.com/en/hotfix-v10-partner-only  -> AhsayCBS 10.3.4.45
#   v7 / v8 / v9: https://www.ahsay.com/en/hotfix-v9-partner-only   -> AhsayCBS 9.15.2.70
# Apply it following the instructions shipped with the hotfix, then reboot the server:
sudo reboot

General update steps for every system are on the Linux and Unix & BSD pages; after updating, see which services to restart.

If you cannot patch yet

Restrict access to the AhsayCBS management interface to trusted IP addresses or require VPN (Huntress).

Look for signs of exploitation

Requests to /rps/api/json/UpdateReceivers.do in the AhsayCBS web access logs (Huntress).
JSP web shells in the directory served by the CBS web application, and unexpected child processes of the AhsayCBS service (Huntress).
Connections to/from 177.4.12.11, 38.60.252.110, 107.191.47.199, 185.220.236.49, 104.234.26.10, 123.202.208.37, downloads from imagefiles-backup.oss-ap-southeast-7.aliyuncs.com, and mining traffic to xmr.kryptex.network:8029 (Huntress).
If indicators are found, re-image the host from a trusted backup, since attackers may have left secondary backdoors (Huntress).

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.

https://www.ahsay.com/en/company/announcements/patch-cve-105133-105134-update ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-105133

Related vulnerabilities

CVE-2026-105134

Sources

Page generated automatically from official sources on 2026-11-03 18:05 UTC and reviewed by an editor. Always confirm with your vendor's advisory.