{"vulnerability": "CVE-2026-56191", "sightings": [{"uuid": "6db8a2cb-e84a-4d99-a264-c4fb05baeb5f", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-56191", "type": "seen", "source": "https://bsky.app/profile/stackflag.bsky.social/post/3mre3pj76me23", "content": "CVE-2026-56191 - microsoft exchange online\nAn attacker can manipulate data in Microsoft Exchange Online without permission, potentially leading to data corruption or unauthorized changes. This affects users who\u2026\n\nToo many irrelevant or confusing CVEs? Use stackflag.com\n\n#microsoft #CVE #infosec", "creation_timestamp": "2026-07-24T00:26:04.239498Z"}, {"uuid": "853b8838-7729-48b5-a14d-ff8847290709", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-56191", "type": "seen", "source": "https://bsky.app/profile/thehackerwire.bsky.social/post/3mreee4ela22q", "content": "\ud83d\udd34 CVE-2026-56191 - Critical (10)\n\nImproper authentication in Microsoft Exchange Online allows an unauthorized attacker to perform t...\n\nhttps://www.thehackerwire.com/vulnerability/CVE-2026-56191/\n\n#infosec #cybersecurity #CVE #vulnerability #security #patchstack", "creation_timestamp": "2026-07-24T03:00:45.907296Z"}, {"uuid": "8c630595-9a28-4bb5-ab32-54bfeaffef1e", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "cve-2026-56191", "type": "seen", "source": "https://infosec.exchange/users/offseq/statuses/116973071665205351", "content": "CVE-2026-56191: CRITICAL improper authentication in Microsoft Exchange Online (CVSS 10). Remote, unauthenticated attackers can tamper with systems. Official fix available \u2014 patch ASAP. Details: https://radar.offseq.com/threat/cve-2026-56191-cwe-287-improper-authentication-in-microsoft-microsoft-exchange-online-2fb5560625ca8222 #OffSeq #CVE202656191 #ExchangeOnline #Vuln", "creation_timestamp": "2026-07-24T04:30:27.233375Z"}, {"uuid": "acacefb2-e3a4-483d-a2c5-bc113ef991cc", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "cve-2026-56191", "type": "seen", "source": "https://bsky.app/profile/offseq.bsky.social/post/3mrejek5ycm2q", "content": "Microsoft Exchange Online faces a CRITICAL improper authentication bug (CVE-2026-56191, CVSS 10). Remote attackers can fully compromise systems. Apply the Microsoft patch now: https://radar.offseq.com/threat/cve-2026-56191-cwe-287-improper-authentication-in-microsoft-microsoft-exchange-online-2fb...", "creation_timestamp": "2026-07-24T04:30:29.304532Z"}, {"uuid": "02e8d3fe-e25c-44c0-9c69-10b96e589779", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2026-56191", "type": "seen", "source": "https://infosec.exchange/users/vuldb/statuses/116973999988486810", "content": "A lot of offensive activities were identified targeting Microsoft Exchange Server (CVE-2026-56191) https://vuldb.com/vuln/382836/cti", "creation_timestamp": "2026-07-24T08:26:31.920068Z"}]}