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.

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)

EPSS: 0.042 (90.0th percentile) — read the EPSS interpretation.

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.

Affected products

Rustfs — versions 1.0.0, < 1.0.0-alpha.83

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

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.