CVE-2026-48611

criticalpriority · track · 11EPSS 0.039 · 90 %ileexploit · PoCEU

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

2 exploits · PoC

Likely / severe?

3.86% (90th) EPSS

CVSS 9.8 · critical

Is it mine?

1 products

Check your exposure

Who says so?

2 sources

cnnvd · enisa_euvd

EPSS · scored 2026-10-28

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.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · support@hackerone.comexploitability 3.9 · impact 5.9

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287US

exploits (2)

Public proof-of-concept and weaponised exploit code.

Ethicalgrey/phpBB-CVE-2026-48611Automated PoC for CVE-2026-48611 — phpBB OAuth login_link authentication bypassPoC · poc_in_github
lxdwnpiper/CVE-2026-48611-phpBBBypass AuthenticationPoC · poc_in_github

affected products (1)

Products and version ranges known to be affected.

phpBB phpBB≤ 3.3.0 ≤3.3.16enisa_euvdEU

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd NVD CVE.org MITRE

published 2026-06-12modified 2026-06-17

references (3)

External citations — patches, advisories, analysis.

scry

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