Security readout for executives and security teams
Plain-English summary
This is a low-severity issue in glb Meetup Tag Extension 0.1 for MediaWiki. Links generated by the extension may let an external target retain access to the opening page through window.opener, creating a reverse-tabnabbing risk. The named fix is version 0.2.
Executive priority
Treat this as routine maintenance unless the affected MediaWiki site is highly trusted or publicly used. The business risk is mainly phishing-style page manipulation after users follow generated links, not server compromise.
Technical view
CVE-2018-25089 affects the Link Attribute Handler in glb Meetup Tag Extension 0.1. Manipulated link attributes can produce links to untrusted targets without opener isolation, mapped to CWE-1022. The supplied CVSS vector shows low integrity impact and no confidentiality or availability impact.
Likely exposure
Exposure is likely limited to MediaWiki sites running glb Meetup Tag Extension 0.1, especially pages that render extension-generated external meetup links. The bundle provides no CPEs and does not identify broader affected products.
Exploitation context
The sources do not show active exploitation, and the CVE is not listed as KEV. The issue is reverse tabnabbing: an untrusted destination may influence the page that opened it. The sources do not provide evidence of public exploitation activity.
Researcher notes
Evidence points to a narrow extension-level link attribute flaw fixed in v0.2. The public description lacks detailed affected-code behavior beyond the Link Attribute Handler and window.opener access. Avoid assuming other MediaWiki extensions or versions are affected.
Mitigation direction
- Upgrade glb Meetup Tag Extension to version 0.2.
- Confirm patch commit 850c726d6bbfe0bf270801fbb92a30babea4155c is present.
- Inventory MediaWiki installations for this extension and version.
- Check vendor or project guidance for any additional hardening.
Validation and detection
- Verify deployed extension version is not 0.1.
- Review generated external links for opener isolation behavior.
- Confirm MediaWiki pages using meetup tags render correctly after upgrade.
- Record whether the extension is installed, enabled, or unused.
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-1022: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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-2018-25089 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
- Low
- CVSS
- 3.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/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:A/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N2.11.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.5LowVector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://vuldb.com/?id.238157CVE reference · vdb-entry, technical-description
- https://vuldb.com/?ctiid.238157CVE reference · signature, permissions-required
- https://github.com/glb/mediawiki-tag-extension-meetup/commit/850c726d6bbfe0bf270801fbb92a30babea4155cCVE reference · patch
- https://github.com/glb/mediawiki-tag-extension-meetup/releases/tag/v0.2CVE reference · patch
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.
Use of Web Link to Untrusted Target with window.opener Access
Use of Web Link to Untrusted Target with window.opener Access represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.