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PatchSiren cyber security CVE debrief

CVE-2026-47366 phpBB CVE debrief

CVE-2026-47366 is a HIGH severity vulnerability in PhpBB, with a CVSS score of 7.2. The vulnerability is caused by improper verification of access permissions when modifying permissions through the Administration Control Panel (ACP). This allows an authenticated administrator to grant permissions beyond the level authorized for their account, resulting in privilege escalation within the administrative interface. The vulnerability was published on [cvePublishedAt](https://www.cve.org/CVERecord?id=CVE-2026-47366) and last modified on [cveModifiedAt](https://nvd.nist.gov/vuln/detail/CVE-2026-47366).

Vendor
phpBB
Product
Unknown
CVSS
HIGH 7.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-12
Advisory published
2026-06-12
Advisory updated
2026-06-12

Who should care

Administrators and users of PhpBB are advised to take immediate action to mitigate this vulnerability.

Technical summary

The vulnerability is caused by improper verification of access permissions when modifying permissions through the Administration Control Panel (ACP). This allows an authenticated administrator to grant permissions beyond the level authorized for their account, resulting in privilege escalation within the administrative interface.

Defensive priority

HIGH

Recommended defensive actions

  • Apply the latest security patches and updates for PhpBB.
  • Restrict access to the Administration Control Panel (ACP) to authorized personnel only.
  • Monitor administrative interface activity for suspicious behavior.

Evidence notes

The vendor and product information is currently unknown, but evidence suggests a connection to PhpBB [ref-4].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47366 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47366

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-47366 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47366

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.