CVE-2026-48611 (GCVE-0-2026-48611)

Vulnerability from cvelistv5 – Published: 2026-06-12 02:27 – Updated: 2026-06-12 12:55
VLAI KEVIntel
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.
Severity
9.8 (Critical)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-287 - Improper Authentication - Generic
Assigner
References
Impacted products
Vendor Product Version
phpBB phpBB Affected: 3.3.0 , ≤ 3.3.16 (semver)
Create a notification for this product.
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 69756ecd-e976-4b99-a8b4-c786d1056cd8

Vulnerability ID: CVE-2026-48611

Status: Confirmed

Status Updated: 2026-07-20 07:57 UTC

Exploited: Yes

Timestamps
First Seen: 2026-07-20
Asserted: 2026-07-20
Scope
Notes: Improper authentication checks in the OAuth implementation allow account hijacking even when OAuth is not configured or enabled leading to... | Affected: phpBB / phpBB | CVSS: 9.8 (CRITICAL) | EPSS: 0.02865 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Improper authentication checks in the OAuth implementation allow account hijacking even when OAuth is not configured or enabled leading to...
Vendor phpBB
Product phpBB
Added Date 2026-07-20T07:57:22.068Z
Cvss Score 9.8
Epss Score 0.02865
Cvss Severity CRITICAL
Epss Percentile 0.8522
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-07-20 08:00 UTC | Updated: 2026-07-20 08:00 UTC
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.