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TI-2026-79955 Aliases CVE-2026-87901

Reflected Cross-Site Scripting in phpBB registration module

Priority LOW 38CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · Low
Fix status
No fix listed

Attack profile from CVSS 3.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

phpBB versions from 3.3.0 through 3.3.18 are affected. Improper sanitization in the registration module allows reflected Cross-Site Scripting (CWE-79), so input is returned to users without proper neutralization. A remote attacker with no privileges needs a user to interact with the crafted page, and a successful attack can expose high confidentiality and integrity impact.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

Improper sanitization in the registration module allows reflected Cross-Site Scripting.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00322 25th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
phpBBphpBB3.3.0 – 3.3.18—No fix listedCNA
  • phpBB VendorphpBB Affected 3.3.0 – 3.3.18 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for phpBB.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Timeline

  1. 2026-10-23 Threatist record created from CVE-2026-87901
  2. 2026-10-24 Priority changed: MEDIUM → LOW
  3. 2026-11-02 CISA SSVC decision points changed

References

Other 1

  • TI-2025-43137 Cross Site Request Forgery vulnerability in Phpbb phbb3 v.3.3.15 allows a local attacker… CVSS 3.1HIGH 8.8
  • TI-2026-35957 Improper authentication in phpBB CVSS 3.0CRITICAL 9.8
  • TI-2006-06889 PHP remote file inclusion vulnerability in includes/bb_usage_stats.php in maluinfo… CVSS 2.0HIGH 10.0
  • TI-2001-01423 prefs.php in phpBB 1.4.0 and earlier allows remote authenticated users to execute… CVSS 3.1HIGH 8.8
  • TI-2007-03812 PHP remote file inclusion vulnerability in link_main.php in the SupaNav 1.0.0 module for… CVSS 2.0HIGH 9.3
  • TI-2006-06915 PHP remote file inclusion vulnerability in includes/functions.php in the Dimension module… CVSS 2.0HIGH 10.0
See all 67 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences