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CVE-2026-78208— exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename

Quick assessment

Affected
exceljs exceljs
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

exceljs是exceljs组织的一款读取和写入Excel文件的JavaScript库。 exceljs 5.0.0之前版本存在输入验证错误漏洞，该漏洞源于Workbook.addImage()函数未能验证文件路径，可能导致攻击者提供任意文件路径读取Node.js进程可访问的任何文件并嵌入生成的工作簿中。

CVSS 7.5 · High EPSS 0.51% · P42

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
exceljs exceljs ≤ 4.4.0 affected
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I. Basic Information for CVE-2026-78208

Vulnerability Information
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Vulnerability Title
exceljs through 4.4.0 Path Traversal via Unvalidated addImage filename
Source: CVE Program / CVE List V5
Vulnerability Description
exceljs through 4.4.0 contains a path traversal vulnerability in the Workbook.addImage() function that fails to validate file paths. Attackers can supply arbitrary file paths to read any file accessible to the Node.js process and embed it in the generated workbook.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
exceljs 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
exceljs是exceljs组织的一款读取和写入Excel文件的JavaScript库。 exceljs 5.0.0之前版本存在输入验证错误漏洞，该漏洞源于Workbook.addImage()函数未能验证文件路径，可能导致攻击者提供任意文件路径读取Node.js进程可访问的任何文件并嵌入生成的工作簿中。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
exceljs exceljs 0 ~ 4.4.0 -

II. Public POCs for CVE-2026-78208

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: /root/flag.txt (PROOF_fe22008b0f9cdaa1) read via unvalidated addImage filename and embedded as xlsx media part xl/media/image1.undefined
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
Upgrade to Pro+
claude_code · 7868 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-78208

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Patches & Fixes for CVE-2026-78208 (1)

Vendor Advisories for CVE-2026-78208 (2)

Same Patch Batch · exceljs · 2026-08-24 · 4 CVEs total

CVE-2026-78207 9.4 CRITICAL exceljs through 4.4.0 Prototype Pollution via deepMerge Reached From Note Serialization
CVE-2026-78209 8.2 HIGH exceljs through 4.4.0 CSV Formula Injection via Unescaped Cell Values
CVE-2026-78206 7.5 HIGH exceljs through 4.4.0 Uncontrolled Resource Consumption via Unbounded xlsx Decompression

IV. Related Vulnerabilities

Same product: exceljs
Same vendor: exceljs
Same weakness: CWE-73

V. Comments for CVE-2026-78208

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