Dark Reader: Ability to request icon-like bitmap data from certain local web servers
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- High
- Impact type
- Information disclosure, Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-200 and CWE-346.
Summary
Dark Reader is an accessibility browser extension that makes web pages colors dark. Prior to 4.9.126, a website can cause the browser extension's image inversion pipeline to request an unauthenticated icon-like bitmap from a locally running web server when the resource uses a known public-like HTTPS URL and is detected as requiring inversion. This behavior can cross the website-to-local-network boundary and disclose limited information associated with the requested resource. The darkreader npm package used for website integration is not affected. This issue is fixed in version 4.9.126 for Firefox and version 4.9.128 for other browsers.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| darkreader | darkreader | before 4.9.128 | 4.9.128 | Patch available | CNA |
- darkreader Vendordarkreader Affected before 4.9.128 Fixed in 4.9.128 Patch available CNA
Remediation
- Fix · CNA darkreader (darkreader) Fixed in 4.9.128
Timeline
- 2026-10-02 Threatist record created from CVE-2026-92706
References
More darkreader vulnerabilities
- TI-2025-41997 Dark Reader gives users the ability to request style sheets from local web servers CVSS 3.1LOW 3.4
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences