What’s Vulnerable › Vulnerabilities

CVE-2021-21376: Information Exposure in OMERO.web

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-23 · updated 2026-06-17
• Weakness: CWE-200

Description

OMERO.web is open source Django-based software for managing microscopy imaging. OMERO.web before version 5.9.0 loads various information about the current user such as their id, name and the groups they are in, and these are available on the main webclient pages. This represents an information exposure vulnerability. Some additional information being loaded is not used by the webclient and is being removed in this release. This is fixed in version 5.9.0.

Affected products

• omero-web: before 5.9.0 — fixed in 5.9.0

How to fix

Upgrade to a fixed version: omero-web 5.9.0. Check the vendor advisory for mitigations.

References

• https://github.com/ome/omero-web/blob/master/CHANGELOG.md#590-march-2021
• https://github.com/ome/omero-web/commit/952f8e5d28532fbb14fb665982211329d137908c
• https://github.com/ome/omero-web/security/advisories/GHSA-gfp2-w5jm-955q
• https://pypi.org/project/omero-web/
• https://www.openmicroscopy.org/security/advisories/2021-SV1/
• https://github.com/ome/omero-web/blob/master/CHANGELOG.md#590-march-2021
• https://github.com/ome/omero-web/commit/952f8e5d28532fbb14fb665982211329d137908c
• https://github.com/ome/omero-web/security/advisories/GHSA-gfp2-w5jm-955q
• https://pypi.org/project/omero-web/
• https://www.openmicroscopy.org/security/advisories/2021-SV1/

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