{"vulnerability": "CVE-2021-40690", "sightings": [{"uuid": "0905d4cd-6d50-4c23-b85c-c2dd9be427d6", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2021-40690", "type": "published-proof-of-concept", "source": "https://t.me/CyberSecurityTechnologies/4474", "content": "#Offensive_security\n1. Ping'ing Apache XML Security (CVE-2021-40690)\nhttps://blog.tint0.com/2021/09/pinging-xmlsec.html\n2. Slack Denial of Service via Hyperlinks in Posts (DOM Clobbering)\nhttps://hackerone.com/reports/1077136", "creation_timestamp": "2022-05-26T04:25:28.000000Z"}, {"uuid": "f24b34ef-8db8-4594-a662-ebfed4a24a08", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "4f29edb9-4c4b-44ca-b041-9b050656b6ae", "vulnerability": "CVE-2021-40690", "type": "published-proof-of-concept", "source": "https://t.me/cissp/4546", "content": "", "creation_timestamp": "2026-09-10T18:00:05.617534Z"}, {"uuid": "29e5bd0d-459f-4191-9642-c343dc290558", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "4f29edb9-4c4b-44ca-b041-9b050656b6ae", "vulnerability": "CVE-2021-40690", "type": "seen", "source": "https://t.me/cissp/4546", "content": "", "creation_timestamp": "2026-09-01T17:00:38.751797Z"}]}