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Vulnerabilities

CVE-2026-39866

High ⚡ Exploit Available
CWE-77 — Weakness Type
Published: Apr 21, 2026  ·  Modified: Apr 28, 2026  ·  Source: NVD
CVSS v3
8.8
🔗 NVD Official
📄 Description (English)

Lawnchair is a free, open-source home app for Android. Prior to commit fcba413f55dd47f8a3921445252849126c6266b2, command injection in release_update.yml workflow dispatch input allows arbitrary code execution. Commit fcba413f55dd47f8a3921445252849126c6266b2 patches the issue.

🤖 AI Executive Summary

CVE-2026-39866 is a critical command injection vulnerability in Lawnchair's GitHub Actions workflow that allows arbitrary code execution through unsanitized workflow dispatch inputs. With a CVSS score of 8.8 and publicly available exploits, this poses an immediate risk to organizations using Lawnchair in their mobile development pipelines. The vulnerability affects all versions prior to the patched commit and requires urgent remediation to prevent supply chain attacks.

📄 Description (Arabic)

🤖 AI Intelligence Analysis Analyzed: Apr 24, 2026 00:36
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability primarily impacts Saudi technology companies, software development firms, and government digital transformation initiatives that utilize Lawnchair in their Android development workflows. High-risk sectors include: (1) Saudi fintech and banking mobile app developers reliant on open-source Android frameworks; (2) Government digital services (SDAIA, NCA) developing citizen-facing mobile applications; (3) Telecommunications companies (STC, Mobily, Zain) building customer-facing Android apps; (4) Healthcare providers developing patient management mobile applications. The supply chain attack vector poses significant risk to downstream users of applications built with compromised Lawnchair instances.
🏢 Affected Saudi Sectors
Software Development & Technology Banking & Financial Services Government & Digital Services Telecommunications Healthcare E-commerce & Retail
⚖️ Saudi Risk Score (AI)
8.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Audit all GitHub Actions workflows using Lawnchair to identify if release_update.yml is present and active
2. Review GitHub Actions audit logs for any suspicious workflow dispatch invocations with unusual parameters
3. Revoke any GitHub tokens or secrets that may have been exposed through compromised workflows
4. Disable workflow dispatch triggers on release_update.yml until patching is complete

PATCHING GUIDANCE:
1. Update Lawnchair to commit fcba413f55dd47f8a3921445252849126c6266b2 or later
2. For organizations maintaining forks: apply the security patch to your repository immediately
3. Verify patch application by reviewing the release_update.yml file for input sanitization

COMPENSATING CONTROLS (if immediate patching not possible):
1. Restrict GitHub Actions workflow dispatch permissions to specific trusted users only
2. Implement GitHub branch protection rules requiring code review before workflow execution
3. Use GitHub Actions environment secrets with minimal required permissions
4. Monitor GitHub Actions logs for suspicious command patterns: backticks, $(), command substitution

DETECTION RULES:
1. Alert on workflow_dispatch events with parameters containing: shell metacharacters (|, &, ;, $, `), command substitution patterns
2. Monitor for unexpected process execution from GitHub Actions runners (curl, wget, git clone from unusual sources)
3. Track changes to release_update.yml workflow files in version control
4. Alert on GitHub token usage outside normal development patterns
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تدقيق جميع سير عمل GitHub Actions التي تستخدم Lawnchair لتحديد ما إذا كان release_update.yml موجوداً ونشطاً
2. مراجعة سجلات تدقيق GitHub Actions للبحث عن استدعاءات سير عمل مريبة بمعاملات غير عادية
3. إلغاء أي رموز GitHub أو أسرار قد تكون قد تعرضت للخطر من خلال سير عمل مخترق
4. تعطيل محفزات workflow dispatch على release_update.yml حتى اكتمال التصحيح

إرشادات التصحيح:
1. تحديث Lawnchair إلى الالتزام fcba413f55dd47f8a3921445252849126c6266b2 أو أحدث
2. للمنظمات التي تحتفظ بنسخ مشتقة: تطبيق التصحيح الأمني على مستودعك على الفور
3. التحقق من تطبيق التصحيح بمراجعة ملف release_update.yml لتعقيم المدخلات

الضوابط البديلة (إذا لم يكن التصحيح الفوري ممكناً):
1. تقييد أذونات GitHub Actions workflow dispatch للمستخدمين الموثوقين المحددين فقط
2. تنفيذ قواعد حماية فرع GitHub التي تتطلب مراجعة الكود قبل تنفيذ سير العمل
3. استخدام أسرار بيئة GitHub Actions بأقل الأذونات المطلوبة
4. مراقبة سجلات GitHub Actions للبحث عن أنماط أوامر مريبة: علامات اقتباس عكسية، $()، استبدال الأوامر

قواعد الكشف:
1. تنبيه على أحداث workflow_dispatch بمعاملات تحتوي على: أحرف ميتا shell (|، &، ;، $، `)، أنماط استبدال الأوامر
2. مراقبة تنفيذ العمليات غير المتوقعة من عدائي GitHub Actions (curl، wget، git clone من مصادر غير عادية)
3. تتبع التغييرات على ملفات سير عمل release_update.yml في التحكم بالإصدار
4. تنبيه على استخدام رموز GitHub خارج أنماط التطوير العادية
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
ECC 2024 A.14.2.1 - Secure development policy and procedures ECC 2024 A.14.2.5 - Secure development environment ECC 2024 A.12.6.1 - Management of technical vulnerabilities ECC 2024 A.12.3.1 - Segregation of development, test and production environments
🔵 SAMA CSF
SAMA CSF ID.GV-1 - Organizational governance and risk management SAMA CSF PR.DS-6 - Data is protected during development and testing SAMA CSF DE.CM-1 - The network is monitored to detect potential cybersecurity events SAMA CSF RS.MI-1 - Incidents are contained
🟡 ISO 27001:2022
ISO 27001:2022 A.8.1 - Organizational controls for information security ISO 27001:2022 A.14.2.1 - Secure development policy ISO 27001:2022 A.14.2.5 - Secure development environment ISO 27001:2022 A.12.6.1 - Management of technical vulnerabilities
🟣 PCI DSS v4.0.1
PCI DSS 6.2 - Ensure all system components and software are protected from known vulnerabilities PCI DSS 6.3.2 - Review of custom code prior to release to production PCI DSS 8.2.1 - Use strong authentication methods
📦 Affected Products / CPE 1 entries
lawnchair:lawnchair
📊 CVSS Score
8.8
/ 10.0 — High
📊 CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack VectorN — None / Network
Attack ComplexityL — Low / Local
Privileges RequiredL — Low / Local
User InteractionN — None / Network
ScopeU — Unchanged
ConfidentialityH — High
IntegrityH — High
AvailabilityH — High
📋 Quick Facts
Severity High
CVSS Score8.8
CWECWE-77
EPSS0.29%
Exploit ✓ Yes
Patch ✓ Yes
Published 2026-04-21
Source Feed nvd
🇸🇦 Saudi Risk Score
8.2
/ 10.0 — Saudi Risk
Priority: CRITICAL
🏷️ Tags
exploit-available patch-available CWE-77
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