Security readout for executives and security teams
Plain-English summary
CVE-2018-25250 affects version 1.2 of the MyBB “Last User's Threads in Profile” plugin. An attacker can create a forum thread with a malicious subject that is stored and later runs in visitors’ browsers when they view the attacker’s profile. This can expose user sessions or alter page content in the context of the forum.
Executive priority
Prioritize internet-facing forums that allow public registration or posting. The business risk is account compromise, user trust damage, and malicious content execution in visitors’ browsers. Treat as high priority where the affected plugin is present.
Technical view
The issue is persistent cross-site scripting, CWE-79. The vulnerable plugin appears to render thread subjects on profile pages without safe output handling. The CVSS 3.1 score is 7.2 with network attack vector, low complexity, no privileges required, and changed scope. Sources identify version 1.2 as affected.
Likely exposure
Exposure is limited to MyBB sites using the Last User's Threads in Profile plugin version 1.2. Organizations not running MyBB or this plugin are not affected based on the provided sources.
Exploitation context
A public ExploitDB reference exists, but the source bundle does not show CISA KEV listing or confirmed active exploitation. Exploitation requires creating a thread subject that is later displayed to users visiting the attacker’s profile page.
Researcher notes
The public record identifies the vulnerable component and behavior, but the supplied sources do not name a fixed release. Avoid assuming core MyBB is affected; the issue is tied to the third-party profile plugin version 1.2.
Mitigation direction
- Inventory MyBB installations for this specific plugin and version 1.2.
- Check the MyBB mod page and vendor guidance for fixed versions or instructions.
- If no fix is available, consider disabling or removing the plugin after business review.
- Restrict untrusted forum posting where feasible until remediation is complete.
Validation and detection
- Confirm whether the plugin is installed on each MyBB forum.
- Verify the installed plugin version against affected version 1.2.
- Review profile pages that list user threads for unsafe rendering of thread subjects.
- Use safe, non-executable test strings in a controlled environment only.
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-2018-25250 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:N/UI:N/S:C/C:L/I:L/A:N3.92.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-44339CVE reference · exploit
- Product ReferenceCVE reference · product
- VulnCheck Advisory: MyBB Last User's Threads in Profile Plugin 1.2 Persistent XSSCVE 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.