CVE-2020-8294
MEDIUMCVSS 5.4/10EPSS 0.90%
Last modified
CVE-2020-8294 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack using Internet Explorer when saving a 'javascript:' URL in markdown format.. EPSS estimates a 0.90% chance of exploitation in the next 30 days.
Description
A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack using Internet Explorer when saving a 'javascript:' URL in markdown format.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Nextcloud Server | < 18.0.11 |
| Nextcloud | Nextcloud Server | >= 19.0.0, < 19.0.5 |
| Nextcloud | Nextcloud Server | >= 20.0.0, < 20.0.2 |
References
- https://hackerone.com/reports/1023787Permissions Required, Third Party Advisory
- https://nextcloud.com/security/advisory/?id=NC-SA-2021-002Vendor Advisory
- https://hackerone.com/reports/1023787Permissions Required, Third Party Advisory
- https://nextcloud.com/security/advisory/?id=NC-SA-2021-002Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-8294?
A missing link validation in Nextcloud Server before 20.0.2, 19.0.5, 18.0.11 allows execution of a stored XSS attack using Internet Explorer when saving a 'javascript:' URL in markdown format.
How severe is CVE-2020-8294?
CVE-2020-8294 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.90% probability of exploitation in the next 30 days.
How do I fix CVE-2020-8294?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2020-8294?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST