CVE-2025-58266Network attack vector

Stored script execution via undisclosed input path

Published Sep 22, 2025 · Updated May 13, 2026

Stored XSS in Fumiki Takahashi Gianism 6.0.0 and earlier allows remote authenticated users to execute scripts in a visitor's browser. Public sources identify multiple affected output and input paths but do not disclose the specific parameter or function that stores unsanitized input for later rendering. Exploitation requires high-privilege access and user interaction, and the injected script can affect browser-session confidentiality, integrity, and availability.

CVSS severity5.9
Medium
EPSS probability0.22%
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 Fumiki Takahashi Gianism 6.0.0 and earlier allows remote authenticated users to execute scripts in a visitor's browser. Public sources identify multiple affected output and input paths but do not disclose the specific parameter or function that stores unsanitized input for later rendering. Exploitation requires high-privilege access and user interaction, and the injected script can affect browser-session confidentiality, integrity, and availability.

The record

CVE
CVE-2025-58266
Published
Sep 22, 2025
Updated
May 13, 2026
Vendor
Fumiki Takahashi
Product
Gianism
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 22, 2025CVE publishedPublication date reported by the CVE source.
  2. May 13, 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=0 <=6.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Fumiki Takahashi · Gianismversion=0 <=6.0.0

Published CVSS scores

5.9PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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

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Your stack

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