CVE-2020-8294 json
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 Explore…
published 2021-02-03 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-29162
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- nextcloud nextcloud_server 18.0.11, 19.0.5, 20.0.2
- nextcloud Package Hub 15 SP3, Package Hub 15 SP2, Package Hub 15 SP1 +3 more 20.0.11-bp153.2.3.1
- nextcloud Package Hub 15 SP2 20.0.7-bp152.2.6.1
- nextcloud openSUSE Leap 15.2 20.0.7-lp152.3.6.1
opensuse advisories openSUSE-SU-2021:1068-1openSUSE-SU-2021:0274-1openSUSE-SU-2021:0262-1
Exploit prediction
0.94% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
Affected products
- n/a Nextcloud Server
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
nextcloud.com
/security/advisory/?id=NC-SA-2021-002
vendor-advisory
-
hackerone.com
/reports/1023787
permissions-required, third-party-advisory
Sources
- CVE List CVE-2020-8294
- NVD CVE-2020-8294
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.