{"apiVersion":"1.0","identifier":"CVE-2026-45127","description":"MyBB is free and open source forum software. Prior to 1.8.40, the ACP Mass Mail module does not validate certain requests correctly, allowing same-site attackers to create draft entries from archived entries by embedding a specially crafted URL. The Resend route in Admin CP, Users & Groups, Mass Mail, Mass Mailing Archive duplicates archived mailing entries into new drafts with mybb_massemails.status set to 0 on GET requests without request forgery protection. The uniquely identifying implementation details include Users & Groups → Mass Mail → Mass Mailing Archive, mybb_massemails.status = 0, and admin/modules/user/mass_mail.php. This issue is fixed in version 1.8.40.","publishedAt":"2026-08-18T16:17:07","lastModifiedAt":"2026-08-19T15:17:03","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-45127","cvssScore":3.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","epssProbability":0.00132,"riskScore":0.35,"affectedProduct":"MyBB","affectedVersions":"<1.8.40","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-45127","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-45127","en":"https://www.redsauce.net/en/cves/CVE-2026-45127","fr":"https://www.redsauce.net/fr/cves/CVE-2026-45127","pt":"https://www.redsauce.net/pt/cves/CVE-2026-45127","de":"https://www.redsauce.net/de/cves/CVE-2026-45127","sk":"https://www.redsauce.net/sk/cves/CVE-2026-45127","el":"https://www.redsauce.net/el/cves/CVE-2026-45127"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-45127"}}