CVE-2026-27822 — AI Deep Analysis Summary

Q: What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: Stored XSS in RustFS object storage. 💥 **Consequences**: Credential theft & full account takeover. Victims click malicious links, triggering scripts in their browser.

Q: Root Cause? (CWE/Flaw)

🛡️ **CWE-79**: Improper Neutralization of Input During Web Page Generation. 🔍 **Flaw**: User-supplied data is stored without sanitization and rendered unsafely in the UI.

Q: Who is affected? (Versions/Components)

📦 **Vendor**: rustfs. 📉 **Affected**: Versions **before 1.0.0-alpha.83**. ✅ **Safe**: 1.0.0-alpha.83 and later.

Q: Is exploitation threshold high? (Auth/Config)

🔐 **Auth Required**: Yes (PR:L). 👀 **User Interaction**: Required (UI:R). 📶 **Network**: Remote (AV:N). ⚠️ **Threshold**: Medium. Attacker needs valid access to upload/store content.

Q: Is there a public Exp? (PoC/Wild Exploitation)

📜 **Public Exploit**: No specific PoC code provided in data. 🌐 **Reference**: Official GitHub Advisory (GHSA-v9fg-3cr2-277j) confirms the flaw. ⚠️ **Risk**: Stored XSS is easily exploitable once data is injected.

Q: Is it fixed officially? (Patch/Mitigation)

🛠️ **Fix**: Upgrade to **RustFS 1.0.0-alpha.83** or newer. 📥 **Source**: Official GitHub Security Advisory link provided. ✅ **Status**: Patch available.

Q: Is it urgent? (Priority Suggestion)

🔥 **Priority**: **HIGH**. 📅 **CVSS**: 9.8 (Critical). ⏳ **Action**: Patch immediately. Stored XSS leads to direct account compromise. Do not ignore.

Updated May 06, 2026 CVSS 9.1 · Critical

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Q1What is this vulnerability? (Essence + Consequences)

🚨 **Essence**: Stored XSS in RustFS object storage. <br>💥 **Consequences**: Credential theft & full account takeover. Victims click malicious links, triggering scripts in their browser.

Q2Root Cause? (CWE/Flaw)

🛡️ **CWE-79**: Improper Neutralization of Input During Web Page Generation. <br>🔍 **Flaw**: User-supplied data is stored without sanitization and rendered unsafely in the UI.

Q3Who is affected? (Versions/Components)

📦 **Vendor**: rustfs. <br>📉 **Affected**: Versions **before 1.0.0-alpha.83**. <br>✅ **Safe**: 1.0.0-alpha.83 and later.

Q4What can hackers do? (Privileges/Data)

🕵️ **Attacker Actions**: Inject malicious scripts into stored objects. <br>🔓 **Impact**: Steal session cookies, exfiltrate credentials, and hijack user accounts.…

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Q5Is exploitation threshold high? (Auth/Config)

🔐 **Auth Required**: Yes (PR:L). <br>👀 **User Interaction**: Required (UI:R). <br>📶 **Network**: Remote (AV:N). <br>⚠️ **Threshold**: Medium. Attacker needs valid access to upload/store content.

Q6Is there a public Exp? (PoC/Wild Exploitation)

📜 **Public Exploit**: No specific PoC code provided in data. <br>🌐 **Reference**: Official GitHub Advisory (GHSA-v9fg-3cr2-277j) confirms the flaw. <br>⚠️ **Risk**: Stored XSS is easily exploitable once data is injected.

Q7How to self-check? (Features/Scanning)

🔍 **Check**: Scan for unsanitized input in storage upload endpoints. <br>🧪 **Test**: Upload payload containing `<script>alert(1)</script>`. If it executes on view, you are vulnerable.…

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Q8Is it fixed officially? (Patch/Mitigation)

🛠️ **Fix**: Upgrade to **RustFS 1.0.0-alpha.83** or newer. <br>📥 **Source**: Official GitHub Security Advisory link provided. <br>✅ **Status**: Patch available.

Q9What if no patch? (Workaround)

🚧 **Workaround**: If upgrade is delayed, implement strict **Input Validation** and **Output Encoding** (HTML entity encoding) for all user-generated content before storage/rendering.…

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Q10Is it urgent? (Priority Suggestion)

🔥 **Priority**: **HIGH**. <br>📅 **CVSS**: 9.8 (Critical). <br>⏳ **Action**: Patch immediately. Stored XSS leads to direct account compromise. Do not ignore.

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Vulnerability detail Full AI analysis (login) rustfs CWE-79