{"id":"CVE-2026-11976","aliases":["EUVD-2026-54300","GHSA-w2mq-7hp5-vcv5"],"status":"published","title":"MonsterInsights Pro 10.2.0/10.2.2 - Backdoored via AWS S3 bucket compromise","description":"The official MonsterInsights Pro update distribution bucket (`monster-insights.s3.amazonaws.com`) was compromised. Both the current release (10.2.2) and the version MonsterInsights rolled back to (10.2.0) contain a malicious file, `class-system-check.php`. Three distinct variants were observed on 2026-06-11, all sharing the same AES-256-GCM key, confirming a single threat actor. The attacker retains write access to the S3 bucket and has been actively iterating on the payload throughout the day.","severity":{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00522,"percentile":0.4458,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-912"],"published":"2026-08-06T16:40:18Z","modified":"2026-08-26T16:31:16Z","products":[{"vendor":"monsterinsights","product":"monsterinsights pro"},{"vendor":"unknown","product":"monsterinsights pro"}],"references":[{"url":"https://wpscan.com/vulnerability/d1250410-b919-4a90-8cf2-04031f9e5e2b/","tags":["exploit","vdb-entry","technical-description"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-11976"},{"url":"https://wpscan.com/vulnerability/d1250410-b919-4a90-8cf2-04031f9e5e2b"},{"url":"https://github.com/advisories/GHSA-w2mq-7hp5-vcv5"}],"sources":{"cve":[{"id":"CVE-2026-11976","title":"MonsterInsights Pro 10.2.0/10.2.2 - Backdoored via AWS S3 bucket compromise","description":"The official MonsterInsights Pro update distribution bucket (`monster-insights.s3.amazonaws.com`) was compromised. Both the current release (10.2.2) and the version MonsterInsights rolled back to (10.2.0) contain a malicious file, `class-system-check.php`. Three distinct variants were observed on 2026-06-11, all sharing the same AES-256-GCM key, confirming a single threat actor. The attacker retains write access to the S3 bucket and has been actively iterating on the payload throughout the day.","status":"published","published":"2026-08-06T16:40:18.955Z","modified":"2026-08-07T13:47:29.29Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-912"],"updated_at":"2026-11-02T14:20:04.809935Z"}],"euvd":[{"id":"EUVD-2026-54300","description":"The official MonsterInsights Pro update distribution bucket (`monster-insights.s3.amazonaws.com`) was compromised. Both the current release (10.2.2) and the version MonsterInsights rolled back to (10.2.0) contain a malicious file, `class-system-check.php`. Three distinct variants were observed on 2026-06-11, all sharing the same AES-256-GCM key, confirming a single threat actor. The attacker retains write access to the S3 bucket and has been actively iterating on the payload throughout the day.","status":"published","published":"2026-08-06T16:40:18Z","modified":"2026-08-07T13:47:29Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T18:02:07.294457Z"}],"ghsa":[{"id":"GHSA-w2mq-7hp5-vcv5","title":"The official MonsterInsights Pro update distribution bucket (`monster-insights.s3.amazonaws.com`)...","description":"The official MonsterInsights Pro update distribution bucket (`monster-insights.s3.amazonaws.com`) was compromised. Both the current release (10.2.2) and the version MonsterInsights rolled back to (10.2.0) contain a malicious file, `class-system-check.php`. Three distinct variants were observed on 2026-06-11, all sharing the same AES-256-GCM key, confirming a single threat actor. The attacker retains write access to the S3 bucket and has been actively iterating on the payload throughout the day.","status":"published","published":"2026-08-07T00:31:13Z","modified":"2026-08-07T15:33:09Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-912"],"updated_at":"2026-11-02T15:10:11.041675Z"}],"nvd":[{"id":"CVE-2026-11976","description":"The official MonsterInsights Pro update distribution bucket (`monster-insights.s3.amazonaws.com`) was compromised. Both the current release (10.2.2) and the version MonsterInsights rolled back to (10.2.0) contain a malicious file, `class-system-check.php`. Three distinct variants were observed on 2026-06-11, all sharing the same AES-256-GCM key, confirming a single threat actor. The attacker retains write access to the S3 bucket and has been actively iterating on the payload throughout the day.","status":"published","published":"2026-08-06T22:16:45.103Z","modified":"2026-08-26T16:31:16.753Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-912"],"updated_at":"2026-11-02T14:12:35.386166Z"}]}}