CVE-2026-45121

4.3 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 calendar module does not check permissions consistently when listing calendars, allowing authenticated users to access titles of calendars that are otherwise inaccessible. The affected calendar-selection paths in calendar.php perform permission checks against an invalid calendar context before returning calendar titles. The uniquely identifying implementation details include titles of inaccessible calendars, and invalid calendar permission context. This issue is fixed in version 1.8.40.

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Produits concernés

mybb

Scores CVSS

Version	Score	Source	Vecteur
3.1	4.3 Moyenne	security-advisories@github.com	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`

Faiblesses (CWE)

CWE-863

Références

https://github.com/mybb/mybb/commit/78e07fea34a6f6c326e668526bfb8e451c19e966
https://github.com/mybb/mybb/releases/tag/mybb_1840
https://github.com/mybb/mybb/security/advisories/GHSA-r25v-7pcm-q34p
https://mybb.com/versions/1.8.40

Ailleurs

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