What is CVE-2026-90581?

CVE-2026-90581 is a medium-severity vulnerability in Cym1102 Nginxwebui, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2026-09-13.

How severe is CVE-2026-90581?

Medium severity. CVSS v3 base score is 6.3 out of 10.

RCE in Cym1102 Nginxwebui

CVE-2026-90581

A vulnerability was determined in cym1102 nginxWebUI up to 4.4.2. This issue affects the function MainController.autoUpdate of the file /adminPage/main/autoUpdate. This manipulation of the argument url causes code injection. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized. The pull request to fix this issue awaits acceptance.

EPSS: 0.002 (15.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

Affected products

Cym1102 Nginxwebui — versions 4.4.0, 4.4.1, 4.4.2

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (issue-tracking, exploit)
cna@vuldb.com (issue-tracking, patch)
cna@vuldb.com (product)

Frequently asked questions

What is CVE-2026-90581?: CVE-2026-90581 is a medium-severity vulnerability in Cym1102 Nginxwebui, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 6.3/10. Published 2026-09-13.
How severe is CVE-2026-90581?: Medium severity. CVSS v3 base score is 6.3 out of 10.