CVE-2026-45125

5.3 Moyenne

Publiée le 18/08/2026 à 18:17 · Modifiée le 08/09/2026 à 23:02 · Analyse NVD reportée · Source : security-advisories@github.com

Description

MyBB is free and open source forum software. Prior to 1.8.40, the Email User controller does not sanitize sender names correctly, resulting in mail header injection. member.php?action=do_emailuser accepts the fromname HTTP parameter for guests or the stored username for authenticated users when the cansendemail group permission is enabled. When mail_handler is set to the default PHP mail value, the sender name is used without sanitization in Return-Path and Reply-To headers, allowing arbitrary headers to be injected with CRLF sequences. This issue is fixed in version 1.8.40.

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Produits concernés

mybb

Scores CVSS

Version	Score	Source	Vecteur
3.1	5.3 Moyenne	security-advisories@github.com	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`

Faiblesses (CWE)

CWE-93

Références

https://github.com/mybb/mybb/commit/5046c56b515d4593297a4f65b0c6ccb0b55baa01
https://github.com/mybb/mybb/releases/tag/mybb_1840
https://github.com/mybb/mybb/security/advisories/GHSA-f626-53q9-pqm9
https://mybb.com/versions/1.8.40

Ailleurs

NVD
CVE.org
CIRCL Vulnerability-Lookup
CERT-FR
GitHub Advisories