CVE-2026-57917

User-assisted SSRF and file disclosure via XXE

Published Jul 27, 2026 · Updated Jul 27, 2026

XXE in Asseco Data Systems proCertum SmartSign before 9.4.3.90 allows attackers to trigger SSRF with a crafted signature file. The signature-file preview parser resolves attacker-controlled external XML entities before the victim clicks Open, issuing requests and, depending on parser configuration, reading local files. Exploitation requires the victim to browse to the crafted file in the file-selection window; local-file disclosure is configuration-dependent, while SSRF occurs during preview.

CVSS severity4.8
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE in Asseco Data Systems proCertum SmartSign before 9.4.3.90 allows attackers to trigger SSRF with a crafted signature file. The signature-file preview parser resolves attacker-controlled external XML entities before the victim clicks Open, issuing requests and, depending on parser configuration, reading local files. Exploitation requires the victim to browse to the crafted file in the file-selection window; local-file disclosure is configuration-dependent, while SSRF occurs during preview.

The record

CVE
CVE-2026-57917
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Asseco Data Systems
Product
proCertum SmartSign
Classifications
CWE-611, CAPEC-664, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <9.4.3.90

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Asseco Data Systems · proCertum SmartSignversion=0 <9.4.3.90

Published CVSS scores

4.8CERT-PLCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-611Improper Restriction of XML External Entity Reference
CAPEC-664Server Side Request Forgery
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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