CVE-2021-21377
OMERO webclient does not validate URL redirects on login or switching group.
4.8
MEDIUM
CVSS 3.1
EPSS 0.31%
Description
OMERO.web is open source Django-based software for managing microscopy imaging. OMERO.web before version 5.9.0 supports redirection to a given URL after performing login or switching the group context. These URLs are not validated, allowing redirection to untrusted sites. OMERO.web 5.9.0 adds URL validation before redirecting. External URLs are not considered valid, unless specified in the omero.web.redirect_allowed_hosts setting.
How to fix CVE-2021-21377
To remediate CVE-2021-21377, upgrade the affected package to a fixed version below.
- —upgrade to 5.9.0 or later
- —upgrade to 952f8e5d28532fbb14fb665982211329d137908c or later
Is CVE-2021-21377 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 5.9.0
- from 0, < 952f8e5d28532fbb14fb665982211329d137908c | from 0, < 5.9.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM4.8 | CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N |