CVE-2026-27822Public exploitNetwork attack vector

Administrative takeover via same-origin PDF preview XSS

Published Feb 25, 2026 · Updated Feb 25, 2026

Stored XSS in the RustFS Console before 1.0.0-alpha.83 allows remote authenticated users to steal administrator credentials. The preview modal trusts a PDF filename or metadata, renders attacker-controlled text/html in a same-origin iframe, and exposes console localStorage. Exploitation requires permission to upload an object and an administrator to preview it; the script can read AccessKeyId, SecretAccessKey, and SessionToken values and take over the account.

CVSS severity9.0
Critical
EPSS probability4.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the RustFS Console before 1.0.0-alpha.83 allows remote authenticated users to steal administrator credentials. The preview modal trusts a PDF filename or metadata, renders attacker-controlled text/html in a same-origin iframe, and exposes console localStorage. Exploitation requires permission to upload an object and an administrator to preview it; the script can read AccessKeyId, SecretAccessKey, and SessionToken values and take over the account.

The record

CVE
CVE-2026-27822
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
RustFS
Product
RustFS
Classifications
CWE-79, T1555.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.0.0-alpha.83

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

RustFS · RustFSversion=< 1.0.0-alpha.83

Published CVSS scores

9.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1555.003Credentials from Web Browsers

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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