Vulnerability · Published Oct 23, 2026 · Assigned by hackerone
CVE-2026-87901
High 8.3
In plain English
A high-severity cross-site scripting in phpBB from phpBB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).
Severity (CVSS 3.0)8.3High
Exploit odds (30 days)0.3%top 74.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Improper sanitization in the registration module allows reflected Cross-Site Scripting.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L