CVE-2026-48611
Improper authentication checks in the OAuth implementation allow account hijacking even when OAuth is not configured or enabled leading to unauthorized...
- Published
- Jun 12, 2026
- Updated
- Jun 12, 2026
- Assigning CNA
- hackerone
- Evidence observed
- Aug 17, 2026
Primary CVSS
nvd · CVSS 3.0
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 86.6%
- Model date
- Oct 15, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
http/cves/2026/CVE-2026-48611.yaml
Nuclei TemplatesDeclared conditions
- network: http($.protocol_keys)
- verification: status,word($.matchers[*].type)
- phpBB-CVE-2026-48611Exploit
Automated PoC for CVE-2026-48611 — phpBB OAuth login_link authentication bypass
Python proof-of-concept exploit that bypasses authentication in phpBB 3.3.16 and below by forging session cookies to gain admin access.
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