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Path TraversalWeakness · CWE-22

CVE-2026-54223

HIGH · 8.6 CVSS v4.0 Published 2026-06-18
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
92/100
Remediation priority · Urgent
Remotely reachable Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
UBB.threads is vulnerable to Path traversal, allowing attackers with privilege to edit templates to read and write any file on the application’s server that application has privileges to, what results in Remote Code Execution.  Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 7.7.5 but may also affect other versions.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

UBB.threads contains a path traversal vulnerability in its template editing functionality. Attackers with privilege to edit templates can manipulate file paths to read and write arbitrary files on the server, leading to remote code execution.

MitigationRestrict or disable template editing privileges until a vendor patch is available; if urgent, audit all accounts with template access and implement strict input validation on file path parameters.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
High
Authentication
X
User interaction
None
Scope
X

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify UBB.threads installation and version
    Search for UBB.threads files in your web root (commonly in /var/www or C:\inetpub). Look for a version.php or similar file that displays the installed version number, or check the admin control panel dashboard for the software version.
    Affected if The installed version matches or precedes the vulnerable version range for CVE-2026-54223.
  2. Verify template editing functionality is enabled
    Access the UBB.threads admin control panel and navigate to the templates section. Check if template editing features are accessible (typically under 'Templates' or 'Look and Feel' settings). Confirm the feature is not disabled or hidden.
    Affected if Template editing functionality is available and accessible to at least one user account.
  3. Audit template editing privileges
    Review user roles and permissions in the admin panel. Identify which user accounts, groups, or permission levels have 'Can edit templates' or equivalent privileges. Check for any unexpected or unauthorized accounts with elevated template permissions.
    Affected if Any user account other than the primary administrator has template editing privileges, or if template editing is accessible to lower-privileged users.
  4. Inspect template file directory permissions
    Examine the directory containing template files (commonly /styles/ or /templates/ within the UBB.threads installation). Verify file system permissions allow write access from the web server process.
    Affected if Template directories are writable by the web server user, enabling the path traversal to succeed.
  5. Review access logs for template editing activity
    Search web server access logs (Apache access_log, Nginx access.log, or IIS logs) for requests to template editing endpoints. Look for unusual patterns such as requests containing ../ or absolute path sequences in template-related parameters.
    Affected if Recent or historical requests to template editing show suspicious path traversal patterns (such as ../../ or absolute file paths in template file parameters).

Your environment is affected if UBB.threads is installed with a vulnerable version, template editing is enabled, and users with template editing privileges exist or template directory permissions allow writes from the web server process.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Restrict or disable template editing privileges until a vendor patch is available; if urgent, audit all accounts with template access and implement strict input validation on file path parameters.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing3.0 h
  • Review / QA4.0 h
16.0 hours of engineering $2,850
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-54223 in production — separate from our analysis above.

No notes yet

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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