{"vulnerability": "CVE-2026-56423", "sightings": [{"uuid": "0370b2f7-ff32-46d2-8303-52f569233772", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-56423", "type": "seen", "source": "https://bsky.app/profile/cyberhub.blog/post/3mpbemkubda2h", "content": "\ud83d\udccc CVE-2026-56423 - MISP Core contained broken access-control checks in the bulk deletion flows for Event Reports\u00a0and Sharing Groups. The affected deleteSelection\u00a0handler... https://www.cyberhub.blog/cves/CVE-2026-56423", "creation_timestamp": "2026-06-27T11:37:06.875983Z"}, {"uuid": "e96af8d4-95fd-4a1e-aa19-d63925e36259", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-56423", "type": "seen", "source": "https://t.me/GithubRedTeam/92758", "content": "\ud83d\udea8 GitHub \u76d1\u63a7\u6d88\u606f\u63d0\u9192\n\n\ud83d\udea8 \u53d1\u73b0\u5173\u952e\u8bcd\uff1a #CVE-2026 #POC\n\n\ud83d\udce6 \u9879\u76ee\u540d\u79f0\uff1a CVE-2026-56423-MISP-deleteSelection-BrokenAccessControl\n\ud83d\udc64 \u9879\u76ee\u4f5c\u8005\uff1a BiiTts\n\ud83d\udee0 \u5f00\u53d1\u8bed\u8a00\uff1a Shell\n\u2b50 Star\u6570\u91cf\uff1a 0  |  \ud83c\udf74 Fork\u6570\u91cf\uff1a 0\n\ud83d\udcc5 \u66f4\u65b0\u65f6\u95f4\uff1a 2026-07-10 01:50:12\n\n\ud83d\udcdd \u9879\u76ee\u63cf\u8ff0\uff1a\nPoC for CVE-2026-56423: MISP deleteSelection broken access control (CWE-862, contributor hard-deletes other orgs' Event Reports/Sharing Groups, CVSS 8.8)\n\n\ud83d\udd17 \u70b9\u51fb\u8bbf\u95ee\u9879\u76ee\u5730\u5740", "creation_timestamp": "2026-07-13T22:00:06.047982Z"}, {"uuid": "ccc3c970-97fd-449e-a66d-789222b4dd93", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-56423", "type": "seen", "source": "https://t.me/GithubRedTeam/92758", "content": "\ud83d\udea8 GitHub \u76d1\u63a7\u6d88\u606f\u63d0\u9192\n\n\ud83d\udea8 \u53d1\u73b0\u5173\u952e\u8bcd\uff1a #CVE-2026 #POC\n\n\ud83d\udce6 \u9879\u76ee\u540d\u79f0\uff1a CVE-2026-56423-MISP-deleteSelection-BrokenAccessControl\n\ud83d\udc64 \u9879\u76ee\u4f5c\u8005\uff1a BiiTts\n\ud83d\udee0 \u5f00\u53d1\u8bed\u8a00\uff1a Shell\n\u2b50 Star\u6570\u91cf\uff1a 0  |  \ud83c\udf74 Fork\u6570\u91cf\uff1a 0\n\ud83d\udcc5 \u66f4\u65b0\u65f6\u95f4\uff1a 2026-07-10 01:50:12\n\n\ud83d\udcdd \u9879\u76ee\u63cf\u8ff0\uff1a\nPoC for CVE-2026-56423: MISP deleteSelection broken access control (CWE-862, contributor hard-deletes other orgs' Event Reports/Sharing Groups, CVSS 8.8)\n\n\ud83d\udd17 \u70b9\u51fb\u8bbf\u95ee\u9879\u76ee\u5730\u5740", "creation_timestamp": "2026-07-14T00:00:09.499073Z"}, {"uuid": "5b1f5625-46f7-4356-8573-4518a90dff27", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-56423", "type": "published-proof-of-concept", "source": "https://t.me/GithubRedTeam/92758", "content": "\ud83d\udea8 GitHub \u76d1\u63a7\u6d88\u606f\u63d0\u9192\n\n\ud83d\udea8 \u53d1\u73b0\u5173\u952e\u8bcd\uff1a #CVE-2026 #POC\n\n\ud83d\udce6 \u9879\u76ee\u540d\u79f0\uff1a CVE-2026-56423-MISP-deleteSelection-BrokenAccessControl\n\ud83d\udc64 \u9879\u76ee\u4f5c\u8005\uff1a BiiTts\n\ud83d\udee0 \u5f00\u53d1\u8bed\u8a00\uff1a Shell\n\u2b50 Star\u6570\u91cf\uff1a 0  |  \ud83c\udf74 Fork\u6570\u91cf\uff1a 0\n\ud83d\udcc5 \u66f4\u65b0\u65f6\u95f4\uff1a 2026-07-10 01:50:12\n\n\ud83d\udcdd \u9879\u76ee\u63cf\u8ff0\uff1a\nPoC for CVE-2026-56423: MISP deleteSelection broken access control (CWE-862, contributor hard-deletes other orgs' Event Reports/Sharing Groups, CVSS 8.8)\n\n\ud83d\udd17 \u70b9\u51fb\u8bbf\u95ee\u9879\u76ee\u5730\u5740", "creation_timestamp": "2026-07-15T00:00:36.555531Z"}, {"uuid": "459e8795-ef66-41a6-aeb1-bafa1475f509", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-56423", "type": "seen", "source": "Telegram/c-tiQItlsunczDQWBYAXRvkiYxV7bIvmHKFdwaGGudIBj1Y", "content": "", "creation_timestamp": "2026-07-16T19:00:13.615262Z"}, {"uuid": "07d26fab-b69f-4044-9cbc-03f69bb7aa67", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-56423", "type": "seen", "source": "Telegram/c-tiQItlsunczDQWBYAXRvkiYxV7bIvmHKFdwaGGudIBj1Y", "content": "", "creation_timestamp": "2026-07-17T00:00:28.960239Z"}, {"uuid": "eb0a07cd-319d-4fd5-9c41-1cd665bd7596", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-56423", "type": "published-proof-of-concept", "source": "Telegram/c-tiQItlsunczDQWBYAXRvkiYxV7bIvmHKFdwaGGudIBj1Y", "content": "", "creation_timestamp": "2026-07-18T01:00:28.080152Z"}]}