Cross-Site Scripting in Scratch browser addons
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
Scratch Addons is a WebExtension that supports both Chrome and Firefox. Scratch Addons before version 1.3.2 is vulnerable to DOM-based XSS. If the victim visited a specific website, the More Links addon of the Scratch Addons extension used incorrect regular expression which caused the HTML-escaped values to be unescaped, leading to XSS. Scratch Addons version 1.3.2 fixes the bug. The extension will be automatically updated by the browser. More Links addon can be disabled via the option of the extension.
Why it matters now
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 |
|---|---|---|---|---|---|
| ScratchAddons | ScratchAddons | before 1.3.2 | 1.3.2 | Patch available | CNA |
- ScratchAddons VendorScratchAddons Affected before 1.3.2 Fixed in 1.3.2 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:scratchaddons:scratch_addons:*:*:*:*:*:*:*:* | before 1.3.2 | Vulnerable | ScratchAddons |
- cpe:2.3:a:scratchaddons:scratch_addons:*:*:*:*:*:*:*:* Versions before 1.3.2 Vulnerable ·ScratchAddons
Remediation
- Fix · CNA ScratchAddons (ScratchAddons) Fixed in 1.3.2
Timeline
- 2026-10-02 Threatist record created from CVE-2020-26239
References
Patch 2
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences