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CVE-2026-70383— Arbitrary file overwrite vulnerability in DigiDoc4 client

Quick assessment

Affected
Estonian Information System Authority (RIA) DigiDoc4
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.

Open Electronic Identity DigiDoc4 Client是Open Electronic Identity组织的一款数字签名与文档加密客户端软件。 Open Electronic Identity DigiDoc4 Client 4.0.0版本至4.11.0之前版本存在安全漏洞，该漏洞源于对受限目录的路径名限制不当，容易受到路径遍历攻击。

CVSS 8.4 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Estonian Information System Authority (RIA) DigiDoc4 4.0.0< 4.11.0 affected
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I. Basic Information for CVE-2026-70383

Vulnerability Information
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Vulnerability Title
Arbitrary file overwrite vulnerability in DigiDoc4 client
Source: CVE Program / CVE List V5
Vulnerability Description
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in Estonian Information System Authority (RIA) DigiDoc4 client. This issue affects DigiDoc4: from 4.0.0 before 4.11.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/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
Open Electronic Identity DigiDoc4 Client 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Open Electronic Identity DigiDoc4 Client是Open Electronic Identity组织的一款数字签名与文档加密客户端软件。 Open Electronic Identity DigiDoc4 Client 4.0.0版本至4.11.0之前版本存在安全漏洞，该漏洞源于对受限目录的路径名限制不当，容易受到路径遍历攻击。
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
Estonian Information System Authority (RIA) DigiDoc4 4.0.0 ~ 4.11.0 -

II. Public POCs for CVE-2026-70383

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9047 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-70383

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Patches & Fixes for CVE-2026-70383 (2)

IV. Related Vulnerabilities

Same vendor: Estonian Information System Authority (RIA)
Same weakness: CWE-22

V. Comments for CVE-2026-70383

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