CVE-2026-24888VulnerabilityPublished 28 Jan 2026

CVE-2026-24888: microsoft maker.js · Prototype Pollution

Affects microsoft maker.jsSource CVE Database V5

Not known to be exploited · CVSS 6.5 Medium · fixed in 0.19.2 : update microsoft maker.js when convenient.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.1 base score

6.5Medium

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

EPSS: 0.9% chance of exploitation in 30 days – higher than 62% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 0.19.2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: None

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

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, 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: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
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 impacted component.
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 on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
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), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC 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
microsoftmaker.js	Affected <=0.19.1	Fixed in–

AI-suggested

European organizations using maker.js should immediately upgrade to version 0.19.2 or later, which includes the patch for this vulnerability. If upgrading is not immediately feasible, implement strict input validation and sanitization on any data passed to makerjs.extendObject to prevent malicious prototype properties from being introduced. Employ runtime security controls such as JavaScript sandboxing or object freezing to limit prototype chain modifications. Conduct thorough code reviews and dependency audits to identify and remediate usage of vulnerable versions. Additionally, restrict network access to development and manufacturing systems using maker.js to trusted users and networks only. Monitor logs for unusual object property manipulations or errors indicative of prototype pollution attempts. Finally, educate developers on secure coding practices related to object property handling to prevent similar issues.

Description

CVE-2026-24888 is a medium severity prototype pollution vulnerability in Microsoft maker.js versions up to 0.19.1. The issue arises from the makerjs.extendObject function, which copies properties from source objects to target objects without proper validation such as hasOwnProperty checks. This allows attackers to inject or modify inherited prototype properties, potentially leading to data manipulation or logic errors in applications using maker.js for 2D vector drawing and CNC/laser cutting modeling. Exploitation does not require authentication or user interaction and can be performed remotely. A patch fixing this issue is included in version 0.

Impact

For European organizations, especially those in manufacturing, industrial design, and CNC/laser cutting sectors, this vulnerability could lead to unauthorized modification of design data or application logic, potentially causing defective product outputs or intellectual property exposure. The integrity of design files and manufacturing instructions could be compromised, leading to financial losses, production delays, or safety hazards if maliciously altered. Confidential information embedded in design metadata might also be exposed or manipulated. Since maker.js is a specialized library, the impact is concentrated on organizations integrating it into their design or manufacturing pipelines. Disruption or manipulation of these processes could have downstream effects on supply chains and product quality. Given the remote exploitability without authentication, attackers could target vulnerable systems over the internet or internal networks, increasing risk for organizations with exposed development or manufacturing environments.

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (opens in a new tab)
Variant weakness
The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.
Implementation
By freezing the object prototype first (for example, Object.freeze(Object.prototype)), modification of the prototype becomes impossible.
Architecture and Design
By blocking modifications of attributes that resolve to object prototype, such as proto or prototype, this weakness can be mitigated.
Implementation · Input Validation
When handling untrusted objects, validating using a schema can be used.
OWASP Cheat Sheets
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V5.1.2 (opens in a new tab)
Attack patterns
Accessing Functionality Not Properly Constrained by ACLs (opens in a new tab)
Exploiting Incorrectly Configured Access Control Security Levels (opens in a new tab)
Manipulating User-Controlled Variables (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 5 Feb 2026, 08:54 UTC

WeaknessesCWE-1321

Technical details

References

Community reviews

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