CVE-2025-59898Network attack vector

Session data theft via stored exclude_dir script

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 /add_exclude_dir?sid= handler stores the exclude_dir POST parameter without sufficient validation, causing attacker-supplied script content to execute when an authenticated user views the affected interface. Exploitation requires low-privileged authentication and interaction by another authenticated user; successful execution exposes session information and permits actions in that user's browser context.

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

What happened

Persistent XSS in Flexense SyncBreeze Enterprise and DiskPulse Enterprise 10.4.18 allows remote authenticated users to steal session data. The /add_exclude_dir?sid= handler stores the exclude_dir POST parameter without sufficient validation, causing attacker-supplied script content to execute when an authenticated user views the affected interface. Exploitation requires low-privileged authentication and interaction by another authenticated user; successful execution exposes session information and permits actions in that user's browser context.

The record

CVE
CVE-2025-59898
Published
Jan 28, 2026
Updated
Jan 28, 2026
Vendor
Flexense Ltd.
Product
DiskPulse Enterprise
Classifications
CWE-79, T1203
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

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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=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

5.4NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1Spanish National Cybersecurity Institute, S.A. (INCIBE)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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