Vulnerability Monitor

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CVE-2021-21377

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.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 4.8, indicating it can be exploited remotely over the network but requires specific conditions to be met though user interaction is required requiring only low-level privileges . The vulnerability impacts confidentiality (data exposure), for affected systems. Impacting 1 product from openmicroscopy organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-03-23T16:15:14.283

Last Modified

2024-11-21T05:48:13.900

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 4.8 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:S/C:P/I:P/A:N

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: SINGLE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

6.8

Impact Score

4.9

Weaknesses

Type: Secondary
CWE-601

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	openmicroscopy	omero.web	< 5.9.0	Yes

References

https://github.com/ome/omero-web/blob/master/CHANGELOG.md#590-march-2021 Release Notes, Third Party Advisory ([email protected])
https://github.com/ome/omero-web/commit/952f8e5d28532fbb14fb665982211329d137908c Patch, Third Party Advisory ([email protected])
https://github.com/ome/omero-web/security/advisories/GHSA-g4rf-pc26-6hmr Third Party Advisory ([email protected])
https://pypi.org/project/omero-web/ Third Party Advisory ([email protected])
https://www.openmicroscopy.org/security/advisories/2021-SV2/ Vendor Advisory ([email protected])
https://github.com/ome/omero-web/blob/master/CHANGELOG.md#590-march-2021 Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/ome/omero-web/commit/952f8e5d28532fbb14fb665982211329d137908c Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/ome/omero-web/security/advisories/GHSA-g4rf-pc26-6hmr Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://pypi.org/project/omero-web/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.openmicroscopy.org/security/advisories/2021-SV2/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For openmicroscopy's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.