CVE-2026-2952Public exploitNetwork attack vector

Unauthenticated command execution via xajaxargs shell injection

Published Feb 22, 2026 · Updated Feb 22, 2026

OS command injection in VaelsysV4 4.1.0 allows remote attackers to execute arbitrary commands through crafted xajaxargs POST data. tree_server.php inserts a supplied timezone value into a shell command without neutralizing separators such as semicolons. No authentication is required, and injected commands run with the web service account's access, including the ability to write a persistent PHP web shell.

CVSS severity9.8
Critical
EPSS probability7.38%
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 VaelsysV4 4.1.0 allows remote attackers to execute arbitrary commands through crafted xajaxargs POST data. tree_server.php inserts a supplied timezone value into a shell command without neutralizing separators such as semicolons. No authentication is required, and injected commands run with the web service account's access, including the ability to write a persistent PHP web shell.

The record

CVE
CVE-2026-2952
Published
Feb 22, 2026
Updated
Feb 22, 2026
Vendor
Vaelsys
Product
VaelsysV4
Classifications
CWE-77, CWE-78, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 22, 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=4.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vaelsys · VaelsysV4version=4.1.0

Published CVSS scores

7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P
5.5VulDBCVSS: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
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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

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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