CVE-2025-59903Network attack vector

Stored XSS via unsanitized SVG uploads

Published Feb 16, 2026 · Updated Feb 16, 2026

Stored XSS in all Kubysoft versions allows remote authenticated users to execute scripts in other users' browsers through SVG uploads. The image upload path stores SVG visual content without sanitizing embedded scripts, and browsers execute the scripts when other users open the resource. Low-privileged access is required to upload the file, and a victim must access it; the resulting script runs in that victim's Kubysoft context.

CVSS severity5.1
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

Stored XSS in all Kubysoft versions allows remote authenticated users to execute scripts in other users' browsers through SVG uploads. The image upload path stores SVG visual content without sanitizing embedded scripts, and browsers execute the scripts when other users open the resource. Low-privileged access is required to upload the file, and a victim must access it; the resulting script runs in that victim's Kubysoft context.

The record

CVE
CVE-2025-59903
Published
Feb 16, 2026
Updated
Feb 16, 2026
Vendor
Kubysoft
Product
Kubysoft
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 16, 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=All versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kubysoft · Kubysoftversion=All versions

Published CVSS scores

5.4National 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')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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