CVE-2025-59899Network attack vector

Session data theft via stored server-option scripts

Published Jan 28, 2026 · Updated Jan 28, 2026

Persistent XSS in Flexense SyncBreeze Enterprise and DiskPulse Enterprise 10.4.18 allows remote authenticated users to steal session data. The /server_options?sid= handler stores five server-option fields without adequately validating their content before rendering it in an authenticated user's browser. Low-privileged access and an authenticated viewer are required; executed script can read or alter data available to that viewer's session.

CVSS severity5.1
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Persistent XSS in Flexense SyncBreeze Enterprise and DiskPulse Enterprise 10.4.18 allows remote authenticated users to steal session data. The /server_options?sid= handler stores five server-option fields without adequately validating their content before rendering it in an authenticated user's browser. Low-privileged access and an authenticated viewer are required; executed script can read or alter data available to that viewer's session.

The record

CVE
CVE-2025-59899
Published
Jan 28, 2026
Updated
Jan 28, 2026
Vendor
Flexense Ltd.
Product
DiskPulse Enterprise
Classifications
CWE-79, T1539
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 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=v10.4.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Flexense Ltd. · DiskPulse Enterpriseversion=v10.4.18
Flexense Ltd. · SyncBreeze Enterpriseversion=v10.4.18

Published CVSS scores

5.1INCIBECVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A: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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1539Steal Web Session Cookie

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo