VDB-377891 · Submit #855074 · CVE-2026-15541

will-moss Isaiah up to 1.36.9 Master Websocket server.go Server.Handle Agent authorization

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.1	$0-$5k	1.42

Summaryinfo

A vulnerability has been found in will-moss Isaiah up to 1.36.9 and classified as critical. This affects the function Server.Handle of the file app/server/server/server.go of the component Master Websocket Handler. The manipulation of the argument Agent leads to authorization. This vulnerability is documented as CVE-2026-15541. The attack can be initiated remotely. There is not any exploit available. The pull request to fix this issue awaits acceptance.

Detailsinfo

A vulnerability was found in will-moss Isaiah up to 1.36.9. It has been rated as critical. This issue affects the function Server.Handle of the file app/server/server/server.go of the component Master Websocket Handler. The manipulation of the argument Agent with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-15541. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/12/2026).

The pull request to fix this issue awaits acceptance.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

will-moss

Name

Isaiah

Version

Website

Product: https://github.com/will-moss/isaiah/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.1

VulDB Base Score: 7.3
VulDB Temp Score: 7.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-862 / CWE-863 / CWE-285
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

07/12/2026 Advisory disclosed
07/12/2026 +0 days VulDB entry created
07/12/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 34
Status: Not defined
Confirmation: 🔒

CVE: CVE-2026-15541 (🔒)
GCVE (CVE): GCVE-0-2026-15541
GCVE (VulDB): GCVE-100-377891

Entryinfo

Created: 07/12/2026 20:17
Changes: 07/12/2026 20:17 (57)
Complete: 🔍
Submitter: Dem0000000
Cache ID: 216::103

Submitinfo

Accepted

Submit #855074: will-moss Isaiah 1.36.9 CWE-862 Missing Authorization (by Dem0000000)