CVE-2026-45127

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Source
https://cve.org/CVERecord?id=CVE-2026-45127
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45127.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-45127
Aliases
  • GHSA-xx78-g79m-qvgq
Published
2026-08-18T15:38:41.434Z
Modified
2026-08-21T03:30:16.075127364Z
Severity
  • 3.5 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N CVSS Calculator
Summary
MyBB: ACP Mass Mail draft resend CSRF
Details

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 mybbmassemails.status set to 0 on GET requests without request forgery protection. The uniquely identifying implementation details include Users & Groups → Mass Mail → Mass Mailing Archive, mybbmassemails.status = 0, and admin/modules/user/mass_mail.php. This issue is fixed in version 1.8.40.

Database specific 
{
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "fixed": "1.8.40"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ],
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-352"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45127.json"
}
References

Affected packages

Git / github.com/mybb/mybb

Affected ranges

Type
GIT
Repo
https://github.com/mybb/mybb
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
a95c5d6730b943adab7e54bc209c051f98843a3b
Fixed
e9942c6d19ac1709b3df7357cfb8810774c8d3ac
Database specific
Show details 
{
    "source": "REFERENCES"
}

Affected versions

Other
mybb_1800
mybb_1801
mybb_1804
mybb_1805
mybb_1806
mybb_1807
mybb_1808
mybb_1809
mybb_1810
mybb_1811
mybb_1812
mybb_1813
mybb_1814
mybb_1815
mybb_1815_build
mybb_1816
mybb_1816_build
mybb_1817
mybb_1817_build
mybb_1818
mybb_1818_build
mybb_1819
mybb_1819_build
mybb_1820
mybb_1820-rc
mybb_1820_build
mybb_1821
mybb_1821_build
mybb_1821pl1
mybb_1822
mybb_1822_build
mybb_1823
mybb_1823_build
mybb_1827
mybb_1827_build
mybb_1828
mybb_1828_build
mybb_1829
mybb_1831
mybb_1831_build
mybb_1832
mybb_1832_build
mybb_1833
mybb_1833_build
mybb_1834
mybb_1834_build
mybb_1835
mybb_1835_build
mybb_1836
mybb_1837
mybb_1837_build
mybb_1838
mybb_1838_build
mybb_1839
mybb_1839_build
mybb_1840_build

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45127.json"