VulnerabilityPublished 26 Mar 2026

CVE-2026-4845: dameng100 muucmf · Cross-site Scripting

Affects dameng100 muucmfSource CVE Database V5

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Public exploit available · CVSS 5.3 Medium.

Data as of 9 Nov 2026, 23:24 UTC

CVSS 4.0 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 27% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: None
User Interaction: Passive
Vulnerable system confidentiality: None
Vulnerable system integrity: Low
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: Passive: Successful exploitation of this vulnerability requires limited interaction by the targeted user with the vulnerable system and the attacker’s payload. These interactions would be considered involuntary and do not require that the user actively subvert protections built into the vulnerable system.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 26 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CVSS exploit maturity: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
dameng100muucmf	Affected =1.9.5.20260309	Fixed in–

AI-suggested

To mitigate CVE-2026-4845, organizations should first restrict access to the /admin/Member/index.html interface by implementing network-level controls such as IP whitelisting, VPN access, or firewall rules to limit exposure to trusted users only. Implement robust input validation and output encoding on the 'Search' parameter to neutralize malicious scripts; if source code modification is possible, sanitize inputs using established libraries or frameworks. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the admin interface. Educate administrators about phishing and social engineering risks to reduce the chance of clicking malicious links. Monitor web server logs for suspicious requests targeting the vulnerable parameter. If feasible, consider upgrading to a newer, patched version of muucmf once available or applying community-developed patches. In the absence of vendor patches, consider deploying web application firewalls (WAFs) with custom rules to detect and block XSS payloads targeting this endpoint. Regularly back up CMS data and configurations to enable recovery in case of compromise.

Description

A flaw has been found in dameng100 muucmf 1.9.5.20260309. Impacted is an unknown function of the file /admin/Member/index.html. This manipulation of the argument Search causes cross site scripting. It is possible to initiate the attack remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Impact

The primary impact of CVE-2026-4845 is on the confidentiality and integrity of administrative sessions within affected installations of dameng100 muucmf. Successful exploitation can allow attackers to execute arbitrary scripts in the context of an administrator's browser, potentially leading to session hijacking, credential theft, or unauthorized changes to the CMS content or configuration. This can result in defacement, data leakage, or further compromise of the underlying system. Since the vulnerability is remotely exploitable without authentication, any exposed admin interface increases risk. However, the requirement for user interaction limits automated mass exploitation. Organizations relying on this CMS for critical web infrastructure or sensitive data management face reputational damage, operational disruption, and potential regulatory consequences if exploited. The lack of vendor response and patch availability prolongs exposure, increasing the window for attackers to leverage published exploits.

Summary

CVE-2026-4845 is a cross-site scripting vulnerability identified in the dameng100 muucmf content management framework, specifically version 1.9.5.20260309. The vulnerability resides in an unspecified function within the /admin/Member/index.html file, where the 'Search' parameter is improperly sanitized, allowing attackers to inject malicious JavaScript code. This flaw can be exploited remotely without requiring authentication, although user interaction is necessary, typically by tricking an administrator into clicking a crafted link or visiting a malicious page. The vulnerability can lead to the execution of arbitrary scripts in the context of the victim's browser session, potentially enabling session hijacking, theft of sensitive information, or unauthorized administrative actions. The CVSS 4.0 base score is 5.3 (medium severity), reflecting the network attack vector, low complexity, no privileges required, but requiring user interaction and having limited impact on confidentiality and integrity. The vendor was notified early but has not issued a patch or response, and while an exploit is publicly available, no confirmed in-the-wild exploitation has been reported. This vulnerability highlights the importance of proper input validation and output encoding in web applications, especially in administrative interfaces.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Mar 2026, 06:16 UTC

Technical details

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