What is CVE-2020-28945?

CVE-2020-28945 is a medium-severity vulnerability in Open-Xchange Appsuite, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-05-03.

How severe is CVE-2020-28945?

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

Is CVE-2020-28945 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Open-Xchange Appsuite

CVE-2020-28945

OX App Suite 7.10.4 and earlier allows XSS via crafted content to reach an undocumented feature, such as ![](http://onerror=Function.constructor, in a Notes item.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-05-03 · 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: 0.011 (63.8th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Open-Xchange Appsuite

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

open-xchange.com (Vendor Advisory)
packetstormsecurity.com/files/162406/OX-App-Suite-OX-Guard-SSRF-DoS-Cross-Site-… (Exploit, VDB Entry, Third Party Advisory)

Frequently asked questions

What is CVE-2020-28945?: CVE-2020-28945 is a medium-severity vulnerability in Open-Xchange Appsuite, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-05-03.
How severe is CVE-2020-28945?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2020-28945 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.