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CVE-2026-57917— Improper Restriction of XML External Entity Reference in proCertum SmartSign

Quick assessment

Affected
Asseco proCertum SmartSign
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.

proCertum SmartSign 会解析来自任意构造的签名文件中的外部 XML 实体，从而导致服务器端请求伪造（SSRF），并可能在特定解析器配置下允许读取本地文件。该 XML 外部实体（XXE）漏洞仅在用户在文件选择窗口中预览文件时即可触发，无需受害者点击“打开”按钮。 此问题已在版本 9.4.3.90 中得到修复。

CVSS 4.8 · Medium EPSS 0.18% · P7

Affected Version Matrix 1

VendorProduct Version RangeStatus
Asseco proCertum SmartSign < 9.4.3.90 affected
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I. Basic Information for CVE-2026-57917

Vulnerability Information
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Vulnerability Title
Improper Restriction of XML External Entity Reference in proCertum SmartSign
Source: CVE Program / CVE List V5
Vulnerability Description
proCertum SmartSign parses external XML entities from arbitrary crafted signature files, enabling SSRF and potentially allowing the reading of local files, depending on the parser's configuration. The XML External Entity (XXE) vulnerability is triggered simply by previewing a file in the file selection window, before the victim clicks “Open”. This issue was fixed in version 9.4.3.90.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Asseco proCertum SmartSign 0 ~ 9.4.3.90 -

II. Public POCs for CVE-2026-57917

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III. Intelligence Information for CVE-2026-57917

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Security Blog Posts for CVE-2026-57917 (1)

Vendor Pages for CVE-2026-57917 (1)

IV. Related Vulnerabilities

Same product: proCertum SmartSign
Same vendor: Asseco
Same weakness: CWE-611

V. Comments for CVE-2026-57917

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