{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/vendors/ractivejs/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.3,"id":"CVE-2026-78181"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["ractive (1.4.4)"],"_cs_severities":["high"],"_cs_tags":["prototype-pollution","web-application","javascript"],"_cs_type":"advisory","_cs_vendors":["ractivejs"],"content_html":"\u003cp\u003eA prototype pollution vulnerability, identified as CVE-2026-78181, exists in the Ractive.js library (versions up to and including 1.4.4). The flaw resides in the 'Ractive#set' function within the Keypath Handler component. By supplying specifically crafted input to this function, a remote, unauthenticated attacker can improperly modify object prototype attributes. This manipulation can alter the behavior of the application's underlying JavaScript objects, which may subsequently be leveraged to achieve code injection or manipulate application logic. Publicly available exploit material exists for this vulnerability, posing an immediate risk to applications relying on affected versions of Ractive.js. As of the time of reporting, the project maintainers have not addressed the issue via a patch.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies an internet-facing application utilizing a vulnerable version of Ractive.js (\u0026lt;= 1.4.4).\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious input payload targeting the 'Ractive#set' function.\u003c/li\u003e\n\u003cli\u003eThe payload includes keys such as '\u003cstrong\u003eproto\u003c/strong\u003e' or 'constructor' to target the JavaScript object prototype.\u003c/li\u003e\n\u003cli\u003eThe application processes the malicious input through the Keypath Handler component.\u003c/li\u003e\n\u003cli\u003eThe prototype pollution occurs, injecting properties into the global Object prototype.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the polluted prototype to influence application logic or bypass security checks.\u003c/li\u003e\n\u003cli\u003eFinal objective: Achieve remote code execution or unauthorized data access within the application context.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation allows for prototype pollution, which can lead to application-wide state manipulation, cross-site scripting (XSS), or remote code execution depending on the application's specific implementation of Ractive.js. All sectors utilizing Ractive.js in versions 1.4.4 or earlier are at risk of remote exploitation.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAudit all internal and external-facing web applications to identify dependencies on Ractive.js versions 1.4.4 or older.\u003c/li\u003e\n\u003cli\u003eImplement strict input validation and sanitization for all data passed to Ractive component methods.\u003c/li\u003e\n\u003cli\u003eIf upgrading is not possible, implement a web application firewall (WAF) rule to block incoming requests containing common prototype pollution keys like '\u003cstrong\u003eproto\u003c/strong\u003e', 'constructor', and 'prototype' in query parameters or POST bodies.\u003c/li\u003e\n\u003cli\u003eMonitor application logs for unusual object property modifications or anomalous JavaScript execution patterns that could indicate attempted prototype pollution.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-08-24T05:41:15Z","date_published":"2026-08-24T05:41:15Z","id":"https://feed.craftedsignal.io/briefs/2026-08-ractivejs-prototype-pollution/","summary":"A prototype pollution vulnerability in the Ractive.js 'Ractive#set' function allows remote attackers to modify object prototype attributes, potentially leading to further exploitation.","title":"Prototype Pollution Vulnerability in Ractive.js","url":"https://feed.craftedsignal.io/briefs/2026-08-ractivejs-prototype-pollution/"}],"language":"en","title":"CraftedSignal Threat Feed - Ractivejs","version":"https://jsonfeed.org/version/1.1"}