Reverse Tabnabbing in showdown
Priority LOW 38CWE-1022Published · Updated
Key facts
- Attack vector
- —
- Privileges required
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- User interaction
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- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
- —
- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
Versions of `showdown` prior to 1.9.1 are vulnerable to [Reverse Tabnabbing](https://www.owasp.org/index.php/Reverse_Tabnabbing). The package uses `target='_blank'` in anchor tags, allowing attackers to access `window.opener` for the original page when opening links. This is commonly used for phishing attacks. ## Recommendation Upgrade to version 1.9.1 or later.
Why it matters now
Fix Fixed showdown (npm): 1.9.1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | showdown (npm) | before 1.9.1 | 1.9.1 | Patch available | GHSA-h6mq-3cj6-h738 |
- showdown (npm) Vendor— Affected before 1.9.1 Fixed in 1.9.1 Patch available GHSA-h6mq-3cj6-h738
Remediation
- Fix · GHSA-h6mq-3cj6-h738 showdown (npm) Fixed in 1.9.1 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-h6mq-3cj6-h738
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences