Improper certificate validation in Backblaze
Priority MEDIUM 42CWE-295Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-295.
Summary
Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 suffer from improper certificate validation in `bztransmit` helper due to hardcoded whitelist of strings in URLs where validation is disabled leading to possible remote code execution via client update functionality.
Why it matters now
EPSS 0.04696 91st percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet
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 |
|---|---|---|---|---|---|
| — | Backblaze | Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 | — | No fix listed | CNA |
- Backblaze Vendor— Affected Backblaze for Windows before 7.0.1.433 and Backblaze for macOS before 7.0.1.434 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-8289
- 2026-10-03 Alias added: GHSA-7f55-fqw6-8jjp
References
Advisory 3
More Backblaze vulnerabilities
- TI-2020-06707 Improper privilege management in Backblaze CVSS 3.1HIGH 7.8
Sources
- CVE-2020-8289 · CVE Program
- CVE-2020-8289 · NVD
- FIRST EPSS
- GHSA-7f55-fqw6-8jjp · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences