XSS in Rustfs

CVE-2026-27822

RustFS is a distributed object storage system built in Rust. Prior to version 1.0.0-alpha.83, a Stored Cross-Site Scripting (XSS) vulnerability in the RustFS Console allows an attacker to execute arbitrary JavaScript in the context of the management console. By bypassing the PDF preview logic, an attacker can steal administrator credentials from `localStorage`, leading to full account takeover and system compromise. Version 1.0.0-alpha.83 fixes the issue.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (28.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-27822: fell from 0.042 to 0.004.

EPSS over last 30 days · oldest: 0.042 · newest: 0.004 · change: -0.038

Affected products

  • Rustfs — versions 1.0.0, < 1.0.0-alpha.83

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-27822?
CVE-2026-27822 is a critical-severity vulnerability in Rustfs, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2026-02-25.
How severe is CVE-2026-27822?
Critical severity. CVSS v3 base score is 9.0 out of 10.