Vulnerability

CVE-2026-48611

Critical· 9.8CVSS9.8EPSS0%

.rules3/5

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.

Threat signal

98/100

Severe

Severity

critical

CVSS

9.8

EPSS

Active

CVSS

v3.0via NVDOpen in FIRST calculator →

9.8/ 10CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.08%

probability of exploitation in next 30 days

p23

higher than 23% of all CVEs

2-day trend↑ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-48611. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCTrack

Total impact on non-trivial mission systems

exploitation: none
automatable: yes
impact: total
mission: support

Lifecycle

2026-06-12Published
2026-06-12Last modified1 source

References

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

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.