CVE-2025-8259Public exploitNetwork attack vector

Unauthenticated command execution via unsanitized xajaxargs

Published Jul 28, 2025 · Updated Apr 15, 2026

OS command injection in Vaelsys VaelsysV4 5.0, 5.1, 5.1.0, 5.2, 5.3, and 5.4.0 allows remote attackers to execute OS commands. The execute_DataObjectProc function in /grid/vgrid_server.php sends attacker-controlled xajaxargs data into OS command processing without neutralizing command syntax. The web interface is reachable without authentication or user interaction, and successful exploitation operates with the web-service process's privileges.

CVSS severity9.8
Critical
EPSS probability3.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Vaelsys VaelsysV4 5.0, 5.1, 5.1.0, 5.2, 5.3, and 5.4.0 allows remote attackers to execute OS commands. The execute_DataObjectProc function in /grid/vgrid_server.php sends attacker-controlled xajaxargs data into OS command processing without neutralizing command syntax. The web interface is reachable without authentication or user interaction, and successful exploitation operates with the web-service process's privileges.

The record

CVE
CVE-2025-8259
Published
Jul 28, 2025
Updated
Apr 15, 2026
Vendor
Vaelsys
Product
VaelsysV4
Classifications
CWE-77, CWE-78, T1190, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.0
  2. Affected versionversion=5.1
  3. Affected versionversion=5.1.0
  4. Affected versionversion=5.2
  5. Affected versionversion=5.3
  6. Affected versionversion=5.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vaelsys · VaelsysV4version=5.0; version=5.1; version=5.1.0; version=5.2; version=5.3; version=5.4.0

Published CVSS scores

6.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3VulDBCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1190Exploit Public-Facing Application
T1059Command and Scripting Interpreter

Public exploit references

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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