What is CVE-2020-16255?

CVE-2020-16255 is a medium-severity vulnerability in ownCloud, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-01-15.

How severe is CVE-2020-16255?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in ownCloud

CVE-2020-16255

ownCloud (Core) before 10.5 allows XSS in login page 'forgot password.'

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-01-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (56.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

ownCloud

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

owncloud.org/security/advisories/ (Broken Link)
owncloud.com/security-advisories/reflected-xss-in-login-page-forgot-password-fu… (Vendor Advisory)

Frequently asked questions

What is CVE-2020-16255?: CVE-2020-16255 is a medium-severity vulnerability in ownCloud, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-01-15.
How severe is CVE-2020-16255?: Medium severity. CVSS v3 base score is 6.1 out of 10.