{"id":"CVE-2026-50752","published":"2026-06-08T11:00:38Z","modified":"2026-06-10T13:36:24Z","title":"Certificate Validation Bypass in VPN Site-to-Site Connections Using IKEv1","vendor":"checkpoint","product":"Quantum Security Gateway","tier":"core","eol":null,"affectedVersions":[{"vendor":"checkpoint","product":"Quantum Security Gateway","versions":["R82.10 with Jumbo Hotfix Take 19 or below","R82 with Jumbo Hotfix Take 103 or below","R81.20 with Jumbo Hotfix Take 141 or below","R81.10, R81, and R80.40"]},{"vendor":"checkpoint","product":"Spark Firewalls","versions":["R80.20.X, R81.10.X, and R82.00.X"]}],"description":{"text":"A weakness in the certificate validation logic of the deprecated IKEv1 key exchange may allow an unauthenticated attacker positioned as a man-in-the-middle to bypass certificate validation in VPN site-to-site connections that use certificate-based authentication. Successful exploitation could allow interception or modification of traffic traversing the VPN tunnel.","provenance":"source","from":"CVE.org"},"summary":null,"cvss":{"score":7.4,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.05005,"percentile":0.9224,"date":"2026-10-31","provenance":"source"},"kev":null,"vulncheckKev":{"dateAdded":"2026-09-16","exploitedFirstSeen":"2026-09-16","ransomware":true,"evidence":[{"url":"https://medium.com/s2wblog/ransomware-landscape-in-h1-2026-statistics-and-key-issues-f15683e233cd","date":"2026-09-16"},{"url":"https://s2w.inc/en/resources/1124","date":"2026-10-08"}],"evidenceTotal":2,"provenance":"source"},"exploited":true,"otx":null,"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"references":[{"url":"https://support.checkpoint.com/results/sk/sk185035","tags":[]}],"techniques":[],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-35046","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-35046","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[],"timeline":[{"date":"2026-06-08","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2026-50752","provenance":"source"},{"date":"2026-09-16","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://medium.com/s2wblog/ransomware-landscape-in-h1-2026-statistics-and-key-issues-f15683e233cd","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":null},"priority":{"score":78.6,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in VulnCheck KEV"},{"name":"Recent KEV listing","points":10.0,"detail":"added 46 days ago"},{"name":"Known ransomware use","points":10.0,"detail":"VulnCheck KEV: Known"},{"name":"EPSS percentile","points":18.45,"detail":"percentile 0.9224"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":0.0,"detail":"0 pulses"},{"name":"CVSS severity","points":5.18,"detail":"base score 7.4"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}