CVE-2026-87901
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CVSS v3.1 (listed by NVD)
8.3
HIGH
Scored by hackerone.com (not yet scored by NVD)
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
CVSS v4.0 (listed by NVD)
—
Not scored
CVSS (listed by CVE.org)
8.3
HIGH
Scored by CNA (hackerone) · v3.0
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
EPSS exploit probability
0.4%
Percentile 32.3%
as of 2026-10-24
CISA KEV
—
Not listed
Attack conditions and impact
Derived from the CNA (via NVD) CVSS 3.0 vector
NetworkNo authUser action
Confidentiality HIntegrity HAvailability L
| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | L | Low (easy) |
| Privileges required PR | N | None |
| User interaction UI | R | Required |
| Scope S | U | Unchanged |
| Confidentiality C | H | High |
| Integrity I | H | High |
| Availability A | L | Low |
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
Description
NVD
Improper sanitization in the registration module allows reflected Cross-Site Scripting.
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / [email protected] (Secondary) | 3.0 | 8.3 HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L |
| CNA / hackerone | 3.0 | 8.3 HIGH | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| phpBB | phpBB | affected: 3.3.0 … <= 3.3.18 default: unaffected |