{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/vendors/gitroom/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":9.8,"id":"CVE-2026-19264"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Postiz"],"_cs_severities":["critical"],"_cs_tags":["path-traversal","instance-takeover","cve-2026-19264"],"_cs_type":"advisory","_cs_vendors":["Gitroom"],"content_html":"\u003cp\u003eCVE-2026-19264 is a critical path traversal vulnerability discovered in Postiz, an open-source social media management tool. The vulnerability originates from improper path sanitization in the application's file upload/retrieval mechanism. Due to a decoding-order mismatch between the Next.js routing layer and the application handler, attackers can use percent-encoded traversal sequences (such as %2e%2e%2f) to bypass route-level security controls. This allows unauthorized access to arbitrary files on the host filesystem.\u003c/p\u003e\n\u003cp\u003eBy reading the server's \u003ccode\u003e.env\u003c/code\u003e configuration file, an unauthenticated attacker can obtain the \u003ccode\u003eJWT_SECRET\u003c/code\u003e used for session signing and the \u003ccode\u003eDATABASE_URL\u003c/code\u003e. Because session tokens in affected versions of Postiz lack expiration claims, the recovered secret allows for the forging of administrative tokens, providing the attacker with permanent and elevated access to the instance. This vulnerability affects Postiz installations using the \u003ccode\u003elocal\u003c/code\u003e storage provider, which is the default configuration.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker probes the application to identify the \u003ccode\u003e/uploads/\u003c/code\u003e endpoint, which is used for file retrieval.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts an HTTP GET request containing percent-encoded path traversal sequences (e.g., \u003ccode\u003eGET /uploads/..%2f..%2f..%2f.env\u003c/code\u003e).\u003c/li\u003e\n\u003cli\u003eThe Next.js routing layer fails to filter the encoded sequences because it does not recognize them as directory separators, allowing the request to reach the application handler.\u003c/li\u003e\n\u003cli\u003eThe application handler decodes the percent-encoded sequences into literal \u003ccode\u003e../\u003c/code\u003e segments, which are then concatenated with the \u003ccode\u003eUPLOAD_DIRECTORY\u003c/code\u003e path.\u003c/li\u003e\n\u003cli\u003eThe application performs a file read via \u003ccode\u003ecreateReadStream()\u003c/code\u003e on the resulting path, successfully resolving to sensitive files outside the intended upload directory.\u003c/li\u003e\n\u003cli\u003eThe attacker reads the contents of the \u003ccode\u003e.env\u003c/code\u003e file from the returned HTTP response body, extracting the \u003ccode\u003eJWT_SECRET\u003c/code\u003e and \u003ccode\u003eDATABASE_URL\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eUsing the \u003ccode\u003eJWT_SECRET\u003c/code\u003e, the attacker signs a forged administrative session token.\u003c/li\u003e\n\u003cli\u003eThe attacker authenticates to the application using the forged token, achieving full instance takeover and administrative control over the platform.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation results in total system compromise. An attacker gains the ability to read any file readable by the application process, leading to the exfiltration of database credentials, OAuth secrets, and session signing keys. By forging session tokens, the attacker can impersonate any user, including administrators, without requiring prior authentication or user interaction. This vulnerability was verified as exploited in proof-of-concept form with a CVSS 3.1 score of 9.8.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cp\u003ePrioritize the following actions to secure vulnerable Postiz environments:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eImmediately upgrade Postiz instances to version 2.22.1 or later to remediate the path traversal vulnerability.\u003c/li\u003e\n\u003cli\u003eTreat the \u003ccode\u003eJWT_SECRET\u003c/code\u003e as compromised on all affected versions; rotate this secret immediately to invalidate existing forged sessions.\u003c/li\u003e\n\u003cli\u003eRotate \u003ccode\u003eDATABASE_URL\u003c/code\u003e credentials and any linked OAuth provider keys that were exposed via the environment file.\u003c/li\u003e\n\u003cli\u003eImplement the following detection logic to monitor for ongoing exploitation attempts targeting the file retrieval path.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-08-10T10:30:47Z","date_published":"2026-08-10T10:30:47Z","id":"https://feed.craftedsignal.io/briefs/2026-08-postiz-path-traversal/","summary":"An unauthenticated path traversal vulnerability (CVE-2026-19264) in Postiz enables remote attackers to read sensitive configuration files, facilitate JWT secret theft, and achieve full instance takeover through forged administrative sessions.","title":"Critical Path Traversal in Postiz Exploited for Instance Takeover","url":"https://feed.craftedsignal.io/briefs/2026-08-postiz-path-traversal/"}],"language":"en","title":"CraftedSignal Threat Feed - Gitroom","version":"https://jsonfeed.org/version/1.1"}