CVE Explorer
CVE-2026-45156
Nextcloud is an open source content collaboration platform. From versions 0.3.0 to before 3.1.0, 5.0.0 to before 5.1.0, and 6.0.0 to before 6.4.0, a missing signature verification in User OIDC allowed a malicious ID4me authority to identify as any user. This issue has been patched in versions 3.1.0, 4.1.0, 5.1.0, 6.4.0 and 8.3.0.
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"security-advisories","vendor":"nextcloud","versions":[{"status":"affected","version":">= 0.3.0, < 3.1.0"},{"status":"affected","version":">= 5.0.0, < 5.1.0"},{"status":"affected","version":">= 6.0.0, < 6.4.0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:b6922fe355543bb13cdbe049d93032a11a888bfde72c942aeb0bd66480f2d6ac · sha256:a2e5b2197a714d54… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:b6922fe355543bb13cdbe049d93032a11a888bfde72c942aeb0bd66480f2d6ac · sha256:a2e5b2197a714d54… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:b6922fe355543bb13cdbe049d93032a11a888bfde72c942aeb0bd66480f2d6ac · sha256:a2e5b2197a714d54… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 source assertions{"name":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qqgv-fqwp-mjpp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qqgv-fqwp-mjpp"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:b6922fe355543bb13cdbe049d93032a11a888bfde72c942aeb0bd66480f2d6ac · sha256:a2e5b2197a714d54… · /containers/cna/references/0
{"name":"https://github.com/nextcloud/user_oidc/pull/1285","tags":["x_refsource_MISC"],"url":"https://github.com/nextcloud/user_oidc/pull/1285"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:b6922fe355543bb13cdbe049d93032a11a888bfde72c942aeb0bd66480f2d6ac · sha256:a2e5b2197a714d54… · /containers/cna/references/1
{"name":"https://hackerone.com/reports/3489490","tags":["x_refsource_MISC"],"url":"https://hackerone.com/reports/3489490"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:b6922fe355543bb13cdbe049d93032a11a888bfde72c942aeb0bd66480f2d6ac · sha256:a2e5b2197a714d54… · /containers/cna/references/2
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.