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CVE-2026-78381— RansomLook Arbitrary File Read via Path Traversal in Post screen Field

Quick assessment

Affected
ransomlook ransomlook
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.

RansomLook是RansomLook团队的一款勒索软件监测与分析平台。 RansomLook 2.0.0及之前版本存在路径遍历漏洞，该漏洞源于对group posts中screen字段的处理存在路径遍历问题，GroupPost.get API处理器将数据库控制的screen值直接与source/目录拼接且未验证解析路径是否在预期目录内，可能导致攻击者读取RansomLook进程可访问的任意文件，进而暴露敏感配置、API凭据、密码哈希等应用程序秘密。

CVSS 8.2 · High EPSS 0.59% · P47

Affected Version Matrix 1

VendorProduct Version RangeStatus
ransomlook ransomlook ≤ 2.0.0 affected
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I. Basic Information for CVE-2026-78381

Vulnerability Information
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Vulnerability Title
RansomLook Arbitrary File Read via Path Traversal in Post screen Field
Source: CVE Program / CVE List V5
Vulnerability Description
RansomLook contains a path traversal vulnerability in the handling of the screen field associated with group posts. The GroupPost.get API handler concatenates the database-controlled screen value directly with the application's source/ directory and opens the resulting path without verifying that the resolved file remains within the intended directory. Because the screen field is free-form and can be populated either through the administrative post editor or through data imported from a remote RansomLook instance, a malicious upstream instance can provide traversal sequences such as ../config/generic.json. When the affected post is subsequently retrieved through the API, RansomLook resolves and reads the attacker-controlled path and returns the contents of the referenced file Base64-encoded in the API response. This can allow an attacker (being admin) controlling imported post data to read arbitrary files accessible to the RansomLook process, potentially exposing sensitive configuration data, API credentials, password hashes, or other application secrets. The attack does not require the malicious upstream to possess an account on the affected RansomLook instance. The vulnerability is addressed by resolving screen paths with os.path.realpath() and verifying that the resolved path remains beneath the application's source/ directory. Validation is performed both when values are written and immediately before files are read. Using canonical paths also prevents traversal through symbolic links that would bypass purely lexical path normalization checks.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
RansomLook 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RansomLook是RansomLook团队的一款勒索软件监测与分析平台。 RansomLook 2.0.0及之前版本存在路径遍历漏洞，该漏洞源于对group posts中screen字段的处理存在路径遍历问题，GroupPost.get API处理器将数据库控制的screen值直接与source/目录拼接且未验证解析路径是否在预期目录内，可能导致攻击者读取RansomLook进程可访问的任意文件，进而暴露敏感配置、API凭据、密码哈希等应用程序秘密。
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
ransomlook ransomlook 0 ~ 2.0.0 -

II. Public POCs for CVE-2026-78381

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9992 chars
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Trigger conditions & impact
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III. Intelligence Information for CVE-2026-78381

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Patches & Fixes for CVE-2026-78381 (1)

Same Patch Batch · ransomlook · 2026-08-24 · 13 CVEs total

CVE-2026-78387 9.4 CRITICAL RansomLook Missing Authorization in Web Configuration Editor Allows Application Configurat
CVE-2026-78555 9.4 CRITICAL RansomLook API Key Disclosure Through /admin/apikeys HTML Source
CVE-2026-78372 9.2 CRITICAL RansomLook Missing Authorization Allows Disclosure of Private Group and Ransom Note Data
CVE-2026-78370 9.2 CRITICAL RansomLook Unauthenticated Database Export Exposes Private Data
CVE-2026-78369 8.8 HIGH Missing Authentication Allows Unauthorized Creation of Crypto Groups in RansomLook
CVE-2026-78391 8.8 HIGH Stored Cross-Site Scripting via Untrusted Cryptocurrency Address Rendering in RansomLook
CVE-2026-78551 8.8 HIGH RansomLook Login Endpoint Allows Timing-Based Username Enumeration and Unthrottled Authent
CVE-2026-78380 8.7 HIGH Private Group and Market Posts Disclosed Through Public Notification Channels in RansomLoo
CVE-2026-78386 8.7 HIGH Unauthenticated Disclosure of Scraping Credentials and Bypass Configuration via RansomLook
CVE-2026-78385 8.2 HIGH RansomLook Analysis PDF Generation Allows Server-Side Request Forgery and Arbitrary Local
CVE-2026-78553 7.0 HIGH Insecure Flask Secret-Key File Permissions Allow Local Administrator Session Forgery in Ra
CVE-2026-78378 6.9 MEDIUM Redis Glob Pattern Injection Allows Unauthorized Enumeration of Private Ransomlook Data

IV. Related Vulnerabilities

Same product: ransomlook
Same vendor: ransomlook
Same weakness: CWE-22

V. Comments for CVE-2026-78381

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