Vulnerability · Published Feb 25, 2026 · Assigned by GitHub_M

CVE-2026-27822Rust has Critical Stored XSS in Preview Modal, leading to Administrative Account Takeover

Critical 9.1

In plain English

A critical-severity cross-site scripting in rustfs from rustfs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 5.1% (higher than 92% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)5.1%top 7.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
rustfs	rustfs	< 1.0.0-alpha.83

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

References

https://github.com/rustfs/rustfs/security/advisories/GHSA-v9fg-3cr2-277j x_refsource_CONFIRM