CVE-2026-3742 describes a cross-site scripting (XSS) vulnerability discovered in YiFang CMS versions 2.0.5–2.0.5. This flaw allows an attacker to inject malicious scripts into the application, potentially compromising user sessions and data. The vulnerability resides in the update function of the app/db/admin/D_singlePage.php file, specifically through manipulation of the Title argument. A public exploit is now available.
Impact and Attack Scenarios
Successful exploitation of CVE-2026-3742 enables an attacker to execute arbitrary JavaScript code within the context of a user's browser session on the YiFang CMS website. This can lead to various malicious actions, including session hijacking, defacement of the website, redirection to phishing sites, and theft of sensitive user data such as login credentials or personal information. Given the public availability of an exploit, the risk of exploitation is elevated. The attack can be initiated remotely, broadening the potential attack surface.
Exploitation Context
CVE-2026-3742 has been publicly disclosed and a proof-of-concept exploit is available, indicating a high probability of exploitation. The vulnerability was reported on 2026-03-08. The vendor, YiFang CMS, was contacted but did not respond. It is not currently listed on KEV or EPSS, but the public exploit warrants immediate attention.
Threat Intelligence
Exploit Status
EPSS
0.03% (7% percentile)
CISA SSVC
CVSS Vector
What do these metrics mean?
- Attack Vector
- Network — remotely exploitable over the internet. No physical or local access required. Widest attack surface.
- Attack Complexity
- Low — no special conditions required. Attacker can exploit reliably without depending on rare configurations or timing.
- Privileges Required
- Low — any valid user account is sufficient. Basic authenticated access required.
- User Interaction
- Required — victim must take an action: open a file, click a link, or visit a crafted page.
- Scope
- Unchanged — impact is limited to the vulnerable component itself.
- Confidentiality
- None — no confidentiality impact. Attacker cannot read protected data.
- Integrity
- Low — attacker can modify some data with limited scope or impact.
- Availability
- None — no availability impact. Service remains fully operational.
Affected Software
Weakness Classification (CWE)
Timeline
- Reserved
- Published
- Modified
- EPSS updated
Mitigation and Workarounds
The primary mitigation for CVE-2026-3742 is to upgrade to a patched version of YiFang CMS. As no fixed version is currently available, consider implementing temporary workarounds to reduce the attack surface. Input validation and sanitization on the Title field in app/db/admin/DsinglePage.php can help prevent malicious code injection. Web application firewalls (WAFs) configured to detect and block XSS payloads targeting this specific file and parameter can also provide a layer of protection. Regularly monitor access logs for suspicious activity related to the DsinglePage.php file. After implementing any mitigation, verify its effectiveness by attempting to inject a simple XSS payload into the Title field and confirming that it is properly sanitized.
How to fix
Update to a patched version of YiFang CMS that resolves the Cross-Site Scripting (XSS) vulnerability. If no version is available, it is recommended to disable or remove the vulnerable component (D_singlePage.php) until a solution is published. As a temporary measure, implement thorough validation and sanitization of user input in the 'Title' field to prevent the injection of malicious code.
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Frequently asked questions
What is CVE-2026-3742 — XSS in YiFang CMS 2.0.5?
CVE-2026-3742 is a cross-site scripting (XSS) vulnerability affecting YiFang CMS versions 2.0.5–2.0.5. It allows attackers to inject malicious scripts via the Title argument in a specific admin file.
Am I affected by CVE-2026-3742 in YiFang CMS 2.0.5?
If you are running YiFang CMS version 2.0.5, you are directly affected by this vulnerability. Upgrade as soon as a patch is available.
How do I fix CVE-2026-3742 in YiFang CMS 2.0.5?
The recommended fix is to upgrade to a patched version of YiFang CMS. Until a patch is released, implement input validation and WAF rules as temporary mitigations.
Is CVE-2026-3742 being actively exploited?
Yes, a public exploit is available, indicating a high probability of active exploitation. Immediate action is required.
Where can I find the official YiFang CMS advisory for CVE-2026-3742?
As of this writing, no official advisory has been released by YiFang CMS. Monitor their website and security mailing lists for updates.
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