What is the CVSS score of CVE-2026-27822?

CVE-2026-27822 has a CVSS 3.1 base score of 9.0 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Rustfs are affected by CVE-2026-27822?

A critical stored XSS vulnerability in RustFS Console (CVE-2026-27822) allows attackers to execute malicious code within the management interface, potentially compromising administrative access and…. A patch is available.

Is there a public PoC exploit available for CVE-2026-27822?

Yes, a public proof-of-concept exploit is available for CVE-2026-27822. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-27822?

Within 24 hours: Immediately inventory all RustFS deployments and restrict console access to trusted networks only; implement enhanced monitoring for suspicious administrative activity. Within 7 days: Evaluate upgrade feasibility to version 1.0.0-alpha.83 or later; deploy WAF rules to filter malicious script payloads in console requests. Within 30 days: Complete RustFS upgrade across all environments; conduct security audit of console logs for evidence of exploitation; reset credentials for all administrative accounts.

Rustfs CVE-2026-27822

CRITICAL

Cross-site Scripting (XSS) (CWE-79)

2026-02-25 security-advisories@github.com

GHSA-v9fg-3cr2-277j

XSS Rustfs

9.0

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

9.0 CRITICAL

AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Feb 25, 2026 - 15:36 vuln.today

Public exploit code

CVE Published

Feb 25, 2026 - 03:16 nvd

CRITICAL 9.0

DescriptionGitHub Advisory

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.

AnalysisAI

Stored XSS in RustFS distributed object storage system before 1.0.0-alpha.83. Malicious JavaScript persists in stored objects and executes when accessed. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate as low-privilege user

Delivery

Upload malicious PDF with embedded XSS payload

Exploit

Bypass PDF preview sanitization logic

Execution

Execute JavaScript in admin console context

Persist

Steal localStorage credentials

Impact

Achieve full account takeover

Access

Authenticate as low-privilege user

Delivery

Upload malicious PDF with embedded XSS payload

Exploit

Bypass PDF preview sanitization logic

Execution

Execute JavaScript in admin console context

Persist

Steal localStorage credentials

Impact

Achieve full account takeover

Vulnerability AssessmentAI

Exploitation	Attacker requires valid RustFS Console login credentials (PR:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	CVSS 9.0. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	Attacker uploads object with XSS payload, other users viewing or downloading the object through the web interface have the JavaScript executed in their browser.
Remediation	Update RustFS. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Immediately inventory all RustFS deployments and restrict console access to trusted networks only; implement enhanced monitoring for suspicious administrative activity. …

Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2026-27822 vulnerability details – vuln.today

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Rustfs CVE-2026-27822

Severity by source

CVSS VectorGitHub Advisory

Lifecycle Timeline

DescriptionGitHub Advisory

AnalysisAI

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External POC / Exploit Code