CVE-2020-8280 json
A missing file type check in Nextcloud Contacts 3.4.0 allows a malicious user to upload SVG files as PNG files to perform cross-site script…
published 2021-01-06 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-29148
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 51%
- public exploits
- 0
- none known
Summary
A missing file type check in Nextcloud Contacts 3.4.0 allows a malicious user to upload SVG files as PNG files to perform cross-site scripting (XSS) attacks.
Patch / fix
- nextcloud contacts 3.4.1
Exploit prediction
0.64% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- hackerone.com https://hackerone.com/reports/998422 referenced PoC, tagged "exploit" by a source, unverified
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 Contacts
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
hackerone.com
/reports/998422
exploit, third-party-advisory
-
nextcloud.com
/security/advisory/?id=NC-SA-2020-044
vendor-advisory
Sources
- CVE List CVE-2020-8280
- NVD CVE-2020-8280
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