VulnerabilityDeferred

CVE-2026-48612

Improper state verification in the OAuth implementation could allow an attacker to manipulate the authentication flow and cause a victim’s account to be linked to an attacker-controlled account.

HIGH 8.0EPSS 0.12%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.12%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

Improper state verification in the OAuth implementation could allow an attacker to manipulate the authentication flow and cause a victim’s account to be linked to an attacker-controlled account. This can result in unauthorized account linking and potential account takeover.

CVSS 3.0: 8.0 HIGHCVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
EPSS: 0.12% probability · 2th percentile
CISA KEV: Not listed
Weakness: CWE-352
Source: support@hackerone.com

References

https://www.phpbb.com/community/viewtopic.php?t=2672170

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.