Auth bypass in Chengdu Qilu Technology Ludashi
CVE-2026-90508
A security flaw has been discovered in Chengdu Qilu Technology Ludashi 6.1026.4715.714. Affected by this vulnerability is the function MessageNotifyCallback in the library ProtectFilter64.sys of the component Message Dispatch Handler. Performing a manipulation results in missing authorization. Attacking locally is a requirement. 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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.4 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
EPSS: 0.002 (4.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 4.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Chengdu Qilu Technology Ludashi — versions 6.1026.4715.714
Weakness classification (CWE)
References
- gist.github.com/lzty/fc5f336dca4c287ab4c22168b6dc8ec2 (exploit)
- vuldb.com/cve/CVE-2026-90508 (third-party-advisory)
- vuldb.com/submit/895271 (third-party-advisory)
- vuldb.com/vuln/403096 (technical-description, vdb-entry)
- vuldb.com/vuln/403096/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-90508?
- CVE-2026-90508 is a low-severity vulnerability in Chengdu Qilu Technology Ludashi, classified under Missing Authorization. CVSS score: 3.4/10. Published 2026-09-13.
- How severe is CVE-2026-90508?
- Low severity. CVSS v3 base score is 3.4 out of 10.