Security readout for executives and security teams
Plain-English summary
CVE-2018-25249 affects MyBB My Arcade Plugin 1.3. A logged-in user can save malicious script content in arcade score comments. That script may run when other users view or edit the comment, risking account misuse or content manipulation within the forum.
Executive priority
Treat as a moderate web application risk. Prioritize forums with public registration, active arcade use, or privileged staff viewing comments. It is not currently sourced as actively exploited, but public exploit information increases urgency for exposed installations.
Technical view
This is a stored cross-site scripting issue, CWE-79, in the comment field for arcade game scores. The CVSS 3.1 score is 6.4, with network attack vector, low complexity, low privileges required, changed scope, and low confidentiality and integrity impact. Availability impact is not indicated.
Likely exposure
Exposure is limited to MyBB forums running My Arcade Plugin version 1.3, especially where authenticated users can submit arcade score comments. Systems without this plugin or version are not indicated as affected by the provided sources.
Exploitation context
A public ExploitDB reference exists, but the provided sources do not show CISA KEV listing or confirmed active exploitation. The issue requires an authenticated user and impacts other users who view or edit affected comments.
Researcher notes
The record identifies MyBB My Arcade Plugin 1.3 only. No affected CPEs or vendor patch details are provided in the bundle. Avoid assuming broader MyBB core impact. Confirm remediation from the plugin page, CVE record, or advisory before closing.
Mitigation direction
- Identify MyBB sites using My Arcade Plugin 1.3.
- Check vendor or plugin maintainer guidance for updates or fixes.
- Restrict arcade score commenting to trusted users where possible.
- Remove or moderate suspicious arcade score comments.
- Temporarily disable the plugin if risk outweighs business need.
Validation and detection
- Inventory MyBB plugins and confirm My Arcade Plugin version.
- Review arcade comment permissions for authenticated users.
- Inspect score comments for unexpected HTML or script content.
- Validate any update or configuration change in staging first.
- Monitor forum reports for unusual account or page behavior.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2018-25249 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N3.12.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-44186CVE reference · exploit
- Product ReferenceCVE reference · product
- VulnCheck Advisory: MyBB My Arcade Plugin 1.3 Persistent XSS via CommentCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.