RCE in Codelibs Fess
CVE-2026-8211
A vulnerability was detected in codelibs Fess up to 15.5.1. Affected by this issue is the function update of the file org/codelibs/fess/app/web/admin/design/AdminDesignAction.java of the component JSP File Handler. The manipulation of the argument content results in code injection. The attack may be performed from remote. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (32.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.9% 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: 0.004 · change: +0.002
Affected products
- Codelibs Fess — versions 15.5.0, 15.5.1
Weakness classification (CWE)
References
- vuldb.com/vuln/362419 (technical-description, vdb-entry)
- vuldb.com/vuln/362419/cti (signature, permissions-required)
- vuldb.com/submit/804293 (third-party-advisory)
- bv3acdnplbr.feishu.cn/docx/Kk1tdEAfAoV6kZxVozUc8UA4nog (exploit)
Frequently asked questions
- What is CVE-2026-8211?
- CVE-2026-8211 is a medium-severity vulnerability in Codelibs Fess, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 4.7/10. Published 2026-05-09.
- How severe is CVE-2026-8211?
- Medium severity. CVSS v3 base score is 4.7 out of 10.