CVE-2026-48611
Critical
Description
Improper authentication checks in the OAuth implementation allow account hijacking even when OAuth is not configured or enabled leading to unauthorized access in default installations.
SeverityCritical
CVSS9.8
Exploit probability—
Product
phpBB
PublishedJun 12, 2026
First seenJun 12, 2026
Weakness typeCWE-287Improper authentication
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| phpBB phpBB | 3.3.0 ≤ v ≤ 3.3.16 | — |
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