GHSA-h6mq-3cj6-h738
Reverse Tabnabbing in showdown
GHSA-h6mq-3cj6-h738 is a low vulnerability (CVSS 3.1) in showdown, published September 3, 2020. No source lists public exploit code. Fixed in showdown 1.9.1.
- Severity
- 3.1 LowCVSS 3.1, GitHub Advisories
- Exploit chance
- UnscoredNo EPSS score yet
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
1.9.1showdown
Description
Versions of showdown prior to 1.9.1 are vulnerable to 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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Affected packages
| Package | Affected | Fixed |
|---|---|---|
showdownnpm | before 1.9.1 | 1.9.1 |
What each source reports
GitHub Advisories Score used
Reverse Tabnabbing in showdown
Versions of showdown prior to 1.9.1 are vulnerable to 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.
- Record
GHSA-h6mq-3cj6-h738- CVSS 3.1
- 3.1 Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N - Weakness
- CWE-1022
- Updated
- 2026-11-02
OSV
Reverse Tabnabbing in showdown
Versions of showdown prior to 1.9.1 are vulnerable to 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.
- Record
GHSA-h6mq-3cj6-h738- CVSS 3.1
- 3.1 Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N - Weakness
- CWE-1022
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.