VulnerabilityPublished 22 Mar 2026Updated 25 Mar 2026

CVE-2026-4563: MacCMS · Authorization Bypass

Affects MacCMSSource CVE Database V5

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Public exploit available · CVSS 5.3 Medium.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 4.0 base score

5.3Medium

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

EPSS: 0.2% chance of exploitation in 30 days – higher than 22% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: None
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: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: None: There is no loss of integrity within 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 22 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 29 Oct 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
MacCMS	Affected =2025.1000.4052	Fixed in–
GitHubhuajihd/MacCMS`pkg:github/huajihd/MacCMS`Other threats	Affected =2025.1000.4052	Fixed in–

CPE configurations (1)

cpe:2.3:a:maccms:maccms:*:*:*:*:*:*:*:*

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AI-suggested

To mitigate CVE-2026-4563, organizations should first verify if their MacCMS installations are running affected versions up to 2025.1000.4052. Immediate steps include restricting access to the order_info endpoint through network-level controls such as IP whitelisting or VPN access to limit exposure. Implementing web application firewalls (WAFs) with custom rules to detect and block suspicious manipulation of the order_id parameter can reduce exploitation risk. Until an official patch is released, code-level mitigation involves adding strict authorization checks to validate that the requesting user has permission to access the specified order_id. Logging and monitoring access to order_info requests should be enhanced to detect anomalous activities. Organizations should also review user roles and permissions to minimize unnecessary access. Finally, maintain awareness of vendor updates and apply patches promptly once available.

Description

A weakness has been identified in MacCMS up to 2025.1000.4052. This vulnerability affects the function order_info of the file application/index/controller/User.php of the component Member Order Detail Interface. This manipulation of the argument order_id causes authorization bypass. It is possible to initiate the attack remotely. The exploit has been made available to the public and could be used for attacks.

Impact

The primary impact of CVE-2026-4563 is unauthorized disclosure of sensitive order and user information due to bypassed authorization controls. This can lead to privacy violations, data leakage, and potential misuse of customer data. For organizations, this may result in reputational damage, regulatory non-compliance (especially under data protection laws like GDPR), and financial losses if attackers leverage exposed data for fraud or social engineering. Since the vulnerability allows remote exploitation without authentication, it broadens the attack surface and increases risk. However, the impact on system integrity and availability is minimal, as the vulnerability does not enable modification or disruption of services. Organizations relying on MacCMS for e-commerce or membership management are particularly at risk, as attackers could harvest order details or impersonate users to gain further access.

References

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