CVE-2025-5887Public exploitNetwork attack vector

Stored XSS via unrestricted HTML file upload

Published Jun 9, 2025 · Updated Jun 9, 2025

Stored XSS in jsnjfz WebStack-Guns 1.0 allows remote authenticated users to execute browser scripts through its file-upload component. UserMgrController.java accepts an .html filename whose multipart content type claims image/png, stores its script-bearing body, and serves it to browsers without neutralization. Exploitation requires low-privilege upload access and a victim to open the stored file, enabling attacker-controlled script execution in that browser.

CVSS severity3.5
Low
EPSS probability0.34%
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 jsnjfz WebStack-Guns 1.0 allows remote authenticated users to execute browser scripts through its file-upload component. UserMgrController.java accepts an .html filename whose multipart content type claims image/png, stores its script-bearing body, and serves it to browsers without neutralization. Exploitation requires low-privilege upload access and a victim to open the stored file, enabling attacker-controlled script execution in that browser.

The record

CVE
CVE-2025-5887
Published
Jun 9, 2025
Updated
Jun 9, 2025
Vendor
jsnjfz
Product
WebStack-Guns
Classifications
CWE-94, CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2025Record 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=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

jsnjfz · WebStack-Gunsversion=1.0

Published CVSS scores

3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
2.0VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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