{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/vendors/anothernote/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":7.2,"id":"CVE-2021-47963"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Anote 1.0"],"_cs_severities":["high"],"_cs_tags":["xss","cve-2021-47963","anote"],"_cs_type":"advisory","_cs_vendors":["AnotherNote"],"content_html":"\u003cp\u003eAnote 1.0 is susceptible to a persistent cross-site scripting (XSS) vulnerability (CVE-2021-47963). This vulnerability enables attackers to inject malicious JavaScript payloads into markdown files stored within the application. When a user opens a compromised markdown file, the embedded script executes, potentially leading to remote code execution on the victim\u0026rsquo;s system. This vulnerability exists because the application fails to properly sanitize user-supplied input when rendering markdown files. Successful exploitation allows an attacker to execute arbitrary commands, steal sensitive data, or perform other malicious actions in the context of the user\u0026rsquo;s browser.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker crafts a malicious markdown file containing an embedded JavaScript payload designed to execute system commands.\u003c/li\u003e\n\u003cli\u003eThe attacker uploads or injects the malicious markdown file into the Anote 1.0 application.\u003c/li\u003e\n\u003cli\u003eThe Anote 1.0 application stores the malicious markdown file without proper sanitization.\u003c/li\u003e\n\u003cli\u003eA victim user opens or previews the malicious markdown file within the Anote 1.0 application.\u003c/li\u003e\n\u003cli\u003eThe application renders the markdown file, executing the embedded JavaScript payload within the user\u0026rsquo;s browser.\u003c/li\u003e\n\u003cli\u003eThe JavaScript payload executes arbitrary code, potentially leading to remote code execution on the victim\u0026rsquo;s computer.\u003c/li\u003e\n\u003cli\u003eThe attacker gains control of the victim\u0026rsquo;s system or performs other malicious actions, such as stealing credentials or sensitive data.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability allows attackers to execute arbitrary code on the victim\u0026rsquo;s computer. This could lead to complete system compromise, data theft, or further lateral movement within the network. The impact can range from data breaches and financial loss to reputational damage and disruption of services. The vulnerability affects any user who interacts with a malicious markdown file within the Anote 1.0 application.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply available patches or updates from AnotherNote to remediate CVE-2021-47963.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rules provided in this brief to detect potential XSS attempts in Anote 1.0.\u003c/li\u003e\n\u003cli\u003eImplement strict input validation and sanitization measures to prevent injection of malicious payloads into markdown files.\u003c/li\u003e\n\u003cli\u003eEducate users about the risks of opening untrusted markdown files and the potential for XSS attacks.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for suspicious activity related to markdown file uploads or requests, as detected by the provided Sigma rules.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-15T19:19:43Z","date_published":"2026-05-15T19:19:43Z","id":"https://feed.craftedsignal.io/briefs/2026-05-cve-2021-47963-xss/","summary":"Anote 1.0 is vulnerable to persistent cross-site scripting (CVE-2021-47963), allowing attackers to inject malicious payloads into markdown files, leading to remote code execution when opened by a victim.","title":"Anote 1.0 Persistent Cross-Site Scripting Vulnerability (CVE-2021-47963)","url":"https://feed.craftedsignal.io/briefs/2026-05-cve-2021-47963-xss/"}],"language":"en","title":"CraftedSignal Threat Feed — AnotherNote","version":"https://jsonfeed.org/version/1.1"}