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Vulnerabilities

Vulnerability · CVE-2026-48611

phpbb phpbb Improper Authentication

Published Jul 20, 2026 · catalog updated Jul 20, 2026 · phpbb phpbb Improper Authentication

Patch now

CVE-2026-48611 is in the CISA known-exploited catalog. Confirm phpbb phpbb Improper Authentication against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (phpbb phpbb Improper Authentication).
  • No version range is stored. A customer cannot check an installed version against this record.
Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
2.89%
Remediation
Remediation guidance
Affected products
vendor phpbb phpbb

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. Initial-access exploit intelligence.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor phpbb phpbbversion unspecified

How to fix CVE-2026-48611

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-48611 is in the CISA known-exploited catalog. Confirm phpbb phpbb Improper Authentication against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Affected version ranges are not on this record. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 2.89%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 20, 2026 · VulnCheck KEV

    Detected

    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. Initial-access exploit intelligence.

  2. Jul 20, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2026-48611

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-48611

    30-day exploitation probability 2.9%

    first.org
  • VulnCheck KEVConfirmed exploitationCVE-2026-48611

    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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.