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MybbApplication

CVE-2019-3578

MEDIUM · 6.1 CVSS v3.1 Published 2019-06-06
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

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
MyBB 1.8.19 has XSS in the resetpassword function.

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

Cross-site scripting (XSS) vulnerability in MyBB 1.8.19's password reset function allows attackers to inject malicious scripts via unsanitized input in the resetpassword mechanism.

MitigationUpdate MyBB to version 1.8.20 or later which contains the security patch, or apply vendor-provided fix to sanitize input in the resetpassword function.

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

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
MybbApplication
Affected:= 1.8.19

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
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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. Determine installed MyBB version
    Log into the MyBB Admin Control Panel and navigate to Home > Dashboard or check the version.php file in the inc/ directory of your MyBB installation
    Affected if The installed version is exactly 1.8.19
  2. Verify password reset is enabled
    In Admin Control Panel, go to Configuration > Settings > User Registration and Profile options and check if 'Allow Password Reset' or similar password recovery option is enabled
    Affected if Password reset functionality is enabled (this is the default and required for the vulnerability to be exploitable)
  3. Inspect resetpassword code for input sanitization
    Examine the member.php file or any file handling the forgotpassword/resetpassword action. Look for the code that processes the username or email input in the password reset form and verify if htmlspecialchars or similar sanitization is applied to user-supplied input before output
    Affected if User input in the password reset flow is not sanitized before being reflected back in the response

You are affected if your MyBB installation is version 1.8.19 AND the password reset feature is enabled AND the resetpassword code lacks input sanitization for user-supplied values.

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

Update MyBB to version 1.8.20 or later which contains the security patch, or apply vendor-provided fix to sanitize input in the resetpassword function.

Fix this in Mybb Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
8.0 hours of engineering $1,420
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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-2019-3578 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data