---
title: "CVE-2026-27822: Rust has Critical Stored XSS in Preview Modal, leading to Administrative Account Takeover"
url: https://erroneo.us/security/cve/CVE-2026-27822/
description: "CVE-2026-27822 (rustfs (crates.io (Rust))): RustFS is a distributed object storage system built in Rust. Prior to version 1.0.0-alpha.83, a Stored…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-02-25
date_modified: 2026-02-25
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-27822"
kev: false
cvss: 9.1
epss: 0.0038
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.4% , percentile 31: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 31% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes rustfs (crates.io (Rust)) < 1.0.0-alpha.83, fixed in 1.0.0-alpha.83 . Check your lockfile, including transitive dependencies.

## What it is

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 packages

- crates.io (Rust) `rustfs` < 1.0.0-alpha.83 → fixed: 1.0.0-alpha.83

## Affected products (CVE record)

- rustfs rustfs: < 1.0.0-alpha.83

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.0 `CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.38% probability of exploitation activity in the next 30 days; percentile 31.

## Sources

- [GitHub Advisory GHSA-v9fg-3cr2-277j](https://github.com/advisories/GHSA-v9fg-3cr2-277j)
- [CVE.org record CVE-2026-27822](https://www.cve.org/CVERecord?id=CVE-2026-27822)
- [NVD entry CVE-2026-27822](https://nvd.nist.gov/vuln/detail/CVE-2026-27822)
- [github.com](https://github.com/rustfs/rustfs/security/advisories/GHSA-v9fg-3cr2-277j)
- [github.com](https://github.com/rustfs/rustfs/releases/tag/1.0.0-alpha.83)

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Source page: https://erroneo.us/security/cve/CVE-2026-27822/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt