{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/nextcloud/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Nextcloud"],"_cs_severities":["high"],"_cs_tags":["nextcloud","vulnerability","sqlinjection"],"_cs_type":"advisory","_cs_vendors":["Nextcloud"],"content_html":"\u003cp\u003eMultiple vulnerabilities have been identified in Nextcloud that could allow a malicious actor to compromise the system. These vulnerabilities could enable an attacker to bypass existing security measures, potentially gaining unauthorized access to sensitive data. Furthermore, the vulnerabilities could facilitate information disclosure, leaking confidential information. The existence of a SQL injection vulnerability poses a significant risk, potentially allowing an attacker to manipulate the database and gain full control of the application. Defenders should prioritize patching Nextcloud instances to mitigate these risks.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker identifies a vulnerable Nextcloud instance.\u003c/li\u003e\n\u003cli\u003eAttacker exploits a vulnerability to bypass authentication mechanisms.\u003c/li\u003e\n\u003cli\u003eAttacker leverages information disclosure vulnerability to gather sensitive information about the system and users.\u003c/li\u003e\n\u003cli\u003eAttacker crafts a SQL injection payload.\u003c/li\u003e\n\u003cli\u003eAttacker injects the malicious SQL payload into a vulnerable input field.\u003c/li\u003e\n\u003cli\u003eThe SQL injection allows the attacker to read sensitive data from the database, such as user credentials.\u003c/li\u003e\n\u003cli\u003eAttacker uses stolen credentials to escalate privileges within the Nextcloud instance.\u003c/li\u003e\n\u003cli\u003eAttacker gains unauthorized access to sensitive data and functionalities, potentially exfiltrating data or disrupting services.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of these vulnerabilities could lead to unauthorized access to sensitive data, including user credentials and confidential files. The SQL injection vulnerability could allow an attacker to gain complete control over the Nextcloud instance, potentially leading to data breaches, service disruption, and reputational damage. The number of affected users depends on the scale of the Nextcloud deployment.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rules in this brief to your SIEM and tune for your environment to detect potential exploitation attempts.\u003c/li\u003e\n\u003cli\u003eReview web server logs for suspicious activity and SQL injection attempts, enabling you to detect and respond to potential attacks (log source: webserver).\u003c/li\u003e\n\u003cli\u003eEnsure Nextcloud instances are updated to the latest patched version to remediate the vulnerabilities (affected_products: Nextcloud).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-13T10:31:10Z","date_published":"2026-05-13T10:31:10Z","id":"https://feed.craftedsignal.io/briefs/2026-05-nextcloud-vulns/","summary":"Multiple vulnerabilities exist in Nextcloud, allowing an attacker to bypass security measures, disclose information, and conduct SQL injection attacks.","title":"Multiple Vulnerabilities in Nextcloud","url":"https://feed.craftedsignal.io/briefs/2026-05-nextcloud-vulns/"}],"language":"en","title":"CraftedSignal Threat Feed — Nextcloud","version":"https://jsonfeed.org/version/1.1"}