Quick answers
- Is CVE-2026-48612 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-48612 being exploited in the wild.
- How severe is CVE-2026-48612?
- High severity, with a CVSS score of 8, published 12 June 2026.
- Which products and versions are affected?
- phpBB phpBB.
- Is there a fix for CVE-2026-48612?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-48612 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-48612?
- Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A Cross-Site Request Forgery (CSRF) vulnerability exists in the phpBB OAuth implementation due to improper verification of the 'state' parameter during the authentication flow. An attacker can exploit this by inducing a victim to initiate an OAuth handshake that completes using the attacker's credentials, leading to unauthorized account linking. This attack requires network connectivity, low-privileged attacker credentials, and user interaction from the victim. Successful exploitation results in a full account takeover by allowing the attacker to log in via the linked third-party provider. The issue is tracked as CWE-352.
Affected products
- phpBB phpBB
Timeline
- 2026-06-12: disclosed
- 2026-06-12: advisory