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Vulnerabilities

CVE-2026-33645

High
Fireshare facilitates self-hosted media and link sharing. In version 1.5.1, an authenticated path traversal vulnerability in Fireshare’s chunked upload endpoint allows an attacker to write arbitrary f
CWE-22 — Weakness Type
Published: Mar 26, 2026  ·  Modified: Apr 2, 2026  ·  Source: NVD
CVSS v3
7.1
🔗 NVD Official
📄 Description (English)

Fireshare facilitates self-hosted media and link sharing. In version 1.5.1, an authenticated path traversal vulnerability in Fireshare’s chunked upload endpoint allows an attacker to write arbitrary files outside the intended upload directory. The `checkSum` multipart field is used directly in filesystem path construction without sanitization or containment checks. This enables unauthorized file writes to attacker-chosen paths writable by the Fireshare process (e.g., container `/tmp`), violating integrity and potentially enabling follow-on attacks depending on deployment. Version 1.5.2 fixes the issue.

🤖 AI Executive Summary

Fireshare 1.5.1 contains an authenticated path traversal vulnerability in the chunked upload endpoint that allows attackers to write arbitrary files outside the intended directory. The vulnerability stems from unsanitized use of the checkSum field in filesystem path construction, potentially enabling integrity violations and follow-on attacks.

📄 Description (Arabic)

تحتوي نسخة Fireshare 1.5.1 على ثغرة اجتياز مسار مصادق عليها في نقطة نهاية التحميل المقسم حيث يتم استخدام حقل checkSum مباشرة في بناء مسار نظام الملفات دون تطهير. يمكن للمهاجمين المصادقين استخدام هذه الثغرة لكتابة ملفات عشوائية في مسارات قابلة للكتابة يمكن الوصول إليها من قبل عملية Fireshare.

🤖 ملخص تنفيذي (AI)

إصدار Fireshare 1.5.1 يحتوي على ثغرة اجتياز المسار المصادق عليها في نقطة نهاية التحميل المقسم التي تسمح للمهاجمين بكتابة ملفات عشوائية خارج الدليل المقصود. تنبع الثغرة من الاستخدام غير المعقم لحقل checkSum في بناء مسار نظام الملفات.

🤖 AI Intelligence Analysis Analyzed: May 9, 2026 22:20
🇸🇦 Saudi Arabia Impact Assessment
Saudi Relevance: medium
🏢 Affected Saudi Sectors
government healthcare banking
🎯 MITRE ATT&CK Techniques
⚖️ Saudi Risk Score (AI)
7.0
/ 10.0
🔧 Remediation Steps (English)
Upgrade Fireshare to version 1.5.2 or later immediately. Implement input validation and sanitization for all file path parameters, particularly the checkSum field. Apply principle of least privilege to Fireshare process permissions. Monitor file system access logs for suspicious write operations outside intended directories.
🔧 خطوات المعالجة (العربية)
قم بترقية Fireshare إلى الإصدار 1.5.2 أو أحدث على الفور. قم بتطبيق التحقق من صحة المدخلات والتطهير لجميع معاملات مسار الملف، خاصة حقل checkSum. طبق مبدأ أقل امتياز لأذونات عملية Fireshare. راقب سجلات الوصول إلى نظام الملفات للعمليات المريبة للكتابة خارج الدلائل المقصودة.
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A1 A2 A3
🔵 SAMA CSF
ID.BE-1 PR.AC-1 PR.AC-3 PR.DS-1
🟡 ISO 27001:2022
A.12.2.1 A.14.2.1 A.14.2.5
📦 Affected Products / CPE 1 entries
shaneisrael:fireshare:1.5.1
📊 CVSS Score
7.1
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredL — Low / Local
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityN — None / Network
IntegrityH — High
AvailabilityL — Low / Local
📋 Quick Facts
Severity High
CVSS Score7.1
CWECWE-22
EPSS0.07%
Exploit No
Patch ✗ No
Published 2026-03-26
Source Feed nvd
Views 4
🇸🇦 Saudi Risk Score
7.0
/ 10.0 — Saudi Risk
Priority: HIGH
🏷️ Tags
CWE-22
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