CVE-2026-6633Public exploitNetwork attack vector

Authenticated browser script execution via unescaped account field

Published Apr 20, 2026 · Updated Apr 20, 2026

Stored cross-site scripting in YiFang CMS 2.0.0 through 2.0.5 allows remote authenticated users to execute scripts in another user's browser. The store method in plugins/yifang_backend_account/logic/admin/L_rbac_admin.php validates only that the account field is present and stores it without HTML escaping. Exploitation requires an authenticated account and a victim to open the permission-management user list, where the stored payload executes and can alter page content in the victim's session.

CVSS severity3.5
Low
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in YiFang CMS 2.0.0 through 2.0.5 allows remote authenticated users to execute scripts in another user's browser. The store method in plugins/yifang_backend_account/logic/admin/L_rbac_admin.php validates only that the account field is present and stores it without HTML escaping. Exploitation requires an authenticated account and a victim to open the permission-management user list, where the stored payload executes and can alter page content in the victim's session.

The record

CVE
CVE-2026-6633
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
YiFang
Product
YiFang CMS
Classifications
CWE-79, CWE-94, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 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=2.0.0
  2. Affected versionversion=2.0.1
  3. Affected versionversion=2.0.2
  4. Affected versionversion=2.0.3
  5. Affected versionversion=2.0.4
  6. Affected versionversion=2.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

YiFang · YiFang CMSversion=2.0.0; version=2.0.1; version=2.0.2; version=2.0.3; version=2.0.4; version=2.0.5

Published CVSS scores

3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/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
4.0VulDBAV:N/AC:L/Au:S/C:N/I:P/A: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 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')
T1059.007JavaScript/JScript

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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