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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.

在 exceljs-hardened 5.0.0 之前的版本中，Workbook.addImage() 函数存在一个路径穿越漏洞，该函数未对文件路径进行验证。攻击者可以提供任意文件路径，读取 Node.js 进程可以访问的任何文件，并将其嵌入生成的工作簿中。

CVSS 7.5 · High EPSS 0.37% · P30

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-hardened before 5.0.0 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

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 Premium
Qwen3.6-35B-A3B · 7868 chars
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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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