{"action":"Upgrade omero-web to 5.9.0 or later.","affected":[{"fixed":"5.9.0","introduced":"0"}],"component":"omero-web","cve_ids":["CVE-2021-21377"],"ecosystem":"PyPI","epss":0.00826,"exploited":false,"fixed_versions":["5.9.0"],"ghsa_id":"GHSA-g4rf-pc26-6hmr","id":"tcs_01M5KFGT6VMAH109E2YA8Q6FWD","modified_at":"2026-07-08T06:27:39.407297766Z","published_at":"2021-03-23T15:26:49Z","references":["https://osv.dev/vulnerability/GHSA-g4rf-pc26-6hmr","https://github.com/ome/omero-web/security/advisories/GHSA-g4rf-pc26-6hmr","https://nvd.nist.gov/vuln/detail/CVE-2021-21377","https://github.com/ome/omero-web/commit/952f8e5d28532fbb14fb665982211329d137908c","https://github.com/ome/omero-web","https://github.com/ome/omero-web/blob/master/CHANGELOG.md#590-march-2021","https://github.com/pypa/advisory-database/tree/main/vulns/omero-web/PYSEC-2021-32.yaml","https://pypi.org/project/omero-web","https://www.openmicroscopy.org/security/advisories/2021-SV2"],"severity":{"label":"medium","score":4.8},"sources":[{"source":"osv","source_id":"GHSA-g4rf-pc26-6hmr","url":"https://osv.dev/vulnerability/GHSA-g4rf-pc26-6hmr"}],"summary":"OMERO webclient does not validate URL redirects on login or switching group."}