{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/isaiah--1.36.9/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.3,"id":"CVE-2026-15541"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Isaiah (\u003c= 1.36.9)"],"_cs_severities":["high"],"_cs_tags":["vulnerability","authorization-bypass","remote-code-execution"],"_cs_type":"advisory","_cs_vendors":["will-moss"],"content_html":"\u003cp\u003eA critical missing authorization vulnerability, identified as CVE-2026-15541, has been discovered in \u003ccode\u003ewill-moss Isaiah\u003c/code\u003e software, affecting all versions up to and including 1.36.9. This flaw resides within the \u003ccode\u003eServer.Handle\u003c/code\u003e function, part of the \u003ccode\u003eMaster Websocket Handler\u003c/code\u003e component located in the \u003ccode\u003eapp/server/server/server.go\u003c/code\u003e file. The vulnerability allows a remote attacker to manipulate the \u003ccode\u003eAgent\u003c/code\u003e argument, bypassing established authorization mechanisms. This exploitation can lead to unauthorized access to sensitive resources or the ability to perform actions typically restricted by proper authorization. The vulnerability has a CVSS v3.1 Base Score of 7.3, highlighting its significant potential impact for organizations utilizing the affected software. While a fix is pending, defenders should prioritize patching or implementing mitigation strategies to prevent exploitation.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003eReconnaissance\u003c/strong\u003e: An attacker identifies a public-facing instance of \u003ccode\u003ewill-moss Isaiah\u003c/code\u003e running a vulnerable version (1.36.9 or earlier).\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eVulnerability Identification\u003c/strong\u003e: The attacker pinpoint the \u003ccode\u003eServer.Handle\u003c/code\u003e function within the \u003ccode\u003eMaster Websocket Handler\u003c/code\u003e component as the specific entry point for the authorization bypass.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eRequest Crafting\u003c/strong\u003e: The attacker crafts a malicious request targeting the \u003ccode\u003eServer.Handle\u003c/code\u003e function, embedding a specially manipulated \u003ccode\u003eAgent\u003c/code\u003e argument.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eAuthorization Bypass\u003c/strong\u003e: Upon processing the crafted request, the \u003ccode\u003ewill-moss Isaiah\u003c/code\u003e application fails to properly validate the manipulated \u003ccode\u003eAgent\u003c/code\u003e argument, leading to an bypass of intended authorization checks.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eUnauthorized Access\u003c/strong\u003e: The attacker gains unauthorized access to resources or performs actions within the \u003ccode\u003eIsaiah\u003c/code\u003e application that would normally require higher privileges or specific user authorization.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eAchieve Objective\u003c/strong\u003e: The attacker leverages the unauthorized access to achieve their malicious objective, such as data exfiltration, system compromise, or further lateral movement.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-15541 can lead to significant unauthorized access within affected \u003ccode\u003ewill-moss Isaiah\u003c/code\u003e instances. Attackers could gain control over system functionalities, access or modify sensitive data, and potentially escalate privileges to achieve full system compromise. The remote nature of the exploit means that any internet-facing \u003ccode\u003eIsaiah\u003c/code\u003e deployments are at risk. Organizations using the vulnerable software could face data breaches, service disruptions, and reputational damage if this flaw is exploited.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePatch CVE-2026-15541 immediately by updating \u003ccode\u003ewill-moss Isaiah\u003c/code\u003e to a version beyond 1.36.9 once available, referencing the advisory.\u003c/li\u003e\n\u003cli\u003eImplement robust logging and monitoring for the \u003ccode\u003ewill-moss Isaiah\u003c/code\u003e application to detect unusual requests or activities related to the \u003ccode\u003eMaster Websocket Handler\u003c/code\u003e component.\u003c/li\u003e\n\u003cli\u003eReview access controls and authorization configurations for \u003ccode\u003ewill-moss Isaiah\u003c/code\u003e deployments to ensure adherence to the principle of least privilege, reducing the potential impact of a successful bypass.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-07-13T08:17:03Z","date_published":"2026-07-13T08:17:03Z","id":"https://feed.craftedsignal.io/briefs/2026-07-cve-2026-15541-will-moss-isaiah/","summary":"A critical missing authorization vulnerability (CVE-2026-15541) exists in the `Server.Handle` function of the `Master Websocket Handler` component within `will-moss Isaiah` versions up to 1.36.9, allowing a remote attacker to bypass authorization controls by manipulating the `Agent` argument, potentially leading to unauthorized access or privilege escalation.","title":"CVE-2026-15541: Missing Authorization in will-moss Isaiah Master Websocket Handler","url":"https://feed.craftedsignal.io/briefs/2026-07-cve-2026-15541-will-moss-isaiah/"}],"language":"en","title":"CraftedSignal Threat Feed - Isaiah (\u003c= 1.36.9)","version":"https://jsonfeed.org/version/1.1"}