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Critical 9.8Published Jun 11, 2026

CVE-2026-48611Improper authentication checks in the OAuth implementation allow account hijacking even when OAuth is not configured or enabled leading to unauthorized access in default installations.

Updated under an hour ago ()

Does this affect you?

It affects phpBB. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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.

CVSS
9.8 CRITICAL (v3.0, CNA)CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-287
Known exploited
Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days)
Not loaded for this CVE
Assigned by
hackerone
NVD analysis
Deferred
Record last updated
Jun 12, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
phpBB phpBB
phpbb:phpbb (from the name)
from 3.3.0 through 3.3.16
CNA record

References

References

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.

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