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CVE-2026-108839— thClaws through 0.141.0 Symlink Following File Write via POST /v1/inputs

Quick assessment

Affected
thClaws thClaws
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

thClaws 0.141.0 版本在 v1 API 的 POST /v1/inputs 端点的 post_inputs 处理器中存在一个链接跟随漏洞。该漏洞允许通过遵循符号链接的方式，在允许写入的区域之外进行文件写入操作。攻击者若在允许的 inputs/ 前缀下植入一个符号链接，即可利用后续经过身份验证的上传操作，以守护进程（daemon）特权在工作区外部写入或截断文件。

CVSS 4.2 · Medium EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1059.001 · PowerShell

Affected Version Matrix 1

VendorProduct Version RangeStatus
thClaws thClaws ≤ 0.141.0 affected
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I. Basic Information for CVE-2026-108839

Vulnerability Information
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Vulnerability Title
thClaws through 0.141.0 Symlink Following File Write via POST /v1/inputs
Source: CVE Program / CVE List V5
Vulnerability Description
thClaws through 0.141.0 contains a link-following vulnerability in the post_inputs handler of the v1 API POST /v1/inputs endpoint that allows writes outside the workspace by following symlinks. Attackers who plant a symlink under the allowed inputs/ prefix can cause later authenticated uploads to write or truncate files outside the workspace with daemon privileges.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
thClaws thClaws 0 ~ 0.141.0 -

II. Public POCs for CVE-2026-108839

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III. Intelligence Information for CVE-2026-108839

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Vendor Advisories for CVE-2026-108839 (1)

Proof of Concept for CVE-2026-108839 (1)

Other References for CVE-2026-108839 (1)

IV. Related Vulnerabilities

Same weakness: CWE-59

V. Comments for CVE-2026-108839

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