CVE-2026-48612 Cross-site request forgery in phpBB
Attackers can manipulate OAuth flows to link victim accounts to attacker-controlled ones, leading to unauthorized account takeover in phpBB.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-48612?
CVE-2026-48612 is a high-severity vulnerability in phpBB, published on 12 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-352
Which versions are affected by CVE-2026-48612?
How do I fix CVE-2026-48612?
No fix has been published for CVE-2026-48612 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-48612 being exploited?
There is no known exploitation of CVE-2026-48612 in the wild and no public exploit code.
Sources
Also known as GHSA-575v-33q9-fpgm.