CVE-2021-21377 - CVE House
Back to Database
Status published Medium CVE-2021-21377

Open Redirect in OMERO.web

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-21377

Credits & Attribution

No credits recorded in the NVD database.

References

More from ome

View All →
CVE-2025-54791
OMERO.web displays unecessary user information when requesting to reset the password
Medium 5.3
CVE-2024-35180
OMERO.web JSONP callback vulnerability
Medium 6.1
CVE-2021-41132
Inconsistent input sanitisation leads to XSS vectors
Critical 9.8
CVE-2021-21376
Information Exposure in OMERO.web
Medium 6.4

Affected Vendor

Affected Software

omero-web
Vulnerable Versions:
< 5.9.0

Timeline

Official Publish: March 23rd, 2021
Last Modified: August 3rd, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N

Weaknesses (CWE)

CWE-601

MITRE ATT&CK TTPs

T1566 Phishing
Initial Access
T1204 User Execution
Execution
T1071 Application Layer Protocol
Command and Control
T1189 Drive-by Compromise
Initial Access
T1036 Masquerading
Defense Evasion