CVE-2026-2557Public exploitNetwork attack vector

Authenticated script injection via unsafe file upload

Published Feb 16, 2026 · Updated Feb 16, 2026

Cross-site scripting in CSKeFu 8.0.0 and 8.0.1 allows remote authenticated users to inject browser-executed script through file uploads. MediaController.java's Upload function accepts crafted file-upload input without neutralizing it before web-page generation, causing a victim's browser to interpret the content as script. A low-privileged account and user interaction are required; exploitation modifies client-side content in the victim's CSKeFu session.

CVSS severity5.4
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in CSKeFu 8.0.0 and 8.0.1 allows remote authenticated users to inject browser-executed script through file uploads. MediaController.java's Upload function accepts crafted file-upload input without neutralizing it before web-page generation, causing a victim's browser to interpret the content as script. A low-privileged account and user interaction are required; exploitation modifies client-side content in the victim's CSKeFu session.

The record

CVE
CVE-2026-2557
Published
Feb 16, 2026
Updated
Feb 16, 2026
Vendor
Chatopera
Product
CSKeFu
Classifications
CWE-79, CWE-94, 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=8.0.0
  2. Affected versionversion=8.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Chatopera · CSKeFuversion=8.0.0; version=8.0.1

Published CVSS scores

4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A:N
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
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 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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007Command and Scripting Interpreter: JavaScript

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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