RCE in Fastadmin
CVE-2026-86244
A security vulnerability has been detected in FastAdmin up to 1.2.0.20210401_beta. Affected is the function register/login of the file application/index/controller/User.php of the component User Controller. Such manipulation of the argument url leads to cross site scripting. The attack may be performed from remote. The exploit has been disclosed publicly and may be used. Upgrading to version 1.2.1.20210731_beta is able to address this issue. The name of the patch is b3d32e2bf3637488cfe2fc58a27a9d2475b2b51b. It is recommended to upgrade the affected component.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.005 (39.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Fastadmin — versions 1.2.0.20210401_beta
Weakness classification (CWE)
References
- vuldb.com/vuln/399399 (technical-description, vdb-entry)
- vuldb.com/vuln/399399/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-86244 (third-party-advisory)
- vuldb.com/submit/898809 (third-party-advisory)
- lhzzz08.github.io/posts/cveapplication4/ (exploit)
- github.com/fastadminnet/fastadmin/commit/b3d32e2bf3637488cfe2fc58a27a9d2475b2b5… (patch)
Frequently asked questions
- What is CVE-2026-86244?
- CVE-2026-86244 is a medium-severity vulnerability in Fastadmin, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-09-07.
- How severe is CVE-2026-86244?
- Medium severity. CVSS v3 base score is 4.3 out of 10.