Webrecorder pywb before 2.6.0 allows XSS because it does not ensure that Jinja2 templates are autoescaped.
Priority LOW 28CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
Webrecorder pywb before 2.6.0 allows XSS because it does not ensure that Jinja2 templates are autoescaped.
Why it matters now
EPSS 0.00699 53rd percentileScored 2026-11-07
Fix Fixed pywb (PyPI): 2.6.0
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 |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | pywb (PyPI) | before 2.6.0 | 2.6.0 | Patch available | GHSA-947x-pv47-pp3q |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- pywb (PyPI) Vendor— Affected before 2.6.0 Fixed in 2.6.0 Patch available GHSA-947x-pv47-pp3q
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:webrecorder:pywb:*:*:*:*:*:*:*:* | before 2.6.0 | Vulnerable | webrecorder |
- cpe:2.3:a:webrecorder:pywb:*:*:*:*:*:*:*:* Versions before 2.6.0 Vulnerable ·webrecorder
Remediation
- Fix · GHSA-947x-pv47-pp3q pywb (PyPI) Fixed in 2.6.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-39286
- 2026-10-03 Alias added: GHSA-947x-pv47-pp3q
References
Advisory 3
Sources
- CVE-2021-39286 · CVE Program
- CVE-2021-39286 · NVD
- FIRST EPSS
- GHSA-947x-pv47-pp3q · GitHub Advisory Database · CC BY 4.0
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