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].

Official resources

CVE-2026-47366 was published on 2026-06-12T04:17:05.390Z and last modified on 2026-06-12T16:07:34.850Z.