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CVE-2026-45286

Nextcloud is an open source content collaboration platform. From versions 5.5.13 to before 5.5.17, and 6.2.0 to before 6.2.3, an authenticated user can enumerate users on the same Nextcloud instance by using the Calendar app's endpoint for suggesting attendees. The sharing restrictions, applied to other endpoints, were not effective here. This issue has been patched in versions 5.5.17 and 6.2.3.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b0cf6e45ef89a21830d74c026bae979ac373f82ed5b070f8e17faeab5a975b8d
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":">= 5.5.13, < 5.5.17"},{"status":"affected","version":">= 6.2.0, < 6.2.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:359d29194167d6c15f62ddcb45ce71dd32b94cdf199e4dd389ed2732ec08e4ab · sha256:7d77d778e04fa621… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:359d29194167d6c15f62ddcb45ce71dd32b94cdf199e4dd389ed2732ec08e4ab · sha256:7d77d778e04fa621… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-200","description":"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:359d29194167d6c15f62ddcb45ce71dd32b94cdf199e4dd389ed2732ec08e4ab · sha256:7d77d778e04fa621… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/nextcloud/calendar/issues/7971","tags":["x_refsource_MISC"],"url":"https://github.com/nextcloud/calendar/issues/7971"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:359d29194167d6c15f62ddcb45ce71dd32b94cdf199e4dd389ed2732ec08e4ab · sha256:7d77d778e04fa621… · /containers/cna/references/1
{"name":"https://github.com/nextcloud/calendar/pull/8197","tags":["x_refsource_MISC"],"url":"https://github.com/nextcloud/calendar/pull/8197"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:359d29194167d6c15f62ddcb45ce71dd32b94cdf199e4dd389ed2732ec08e4ab · sha256:7d77d778e04fa621… · /containers/cna/references/2
{"name":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r697-74m9-gvf2","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r697-74m9-gvf2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:359d29194167d6c15f62ddcb45ce71dd32b94cdf199e4dd389ed2732ec08e4ab · sha256:7d77d778e04fa621… · /containers/cna/references/0
{"name":"https://hackerone.com/reports/3540663","tags":["x_refsource_MISC"],"url":"https://hackerone.com/reports/3540663"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:359d29194167d6c15f62ddcb45ce71dd32b94cdf199e4dd389ed2732ec08e4ab · sha256:7d77d778e04fa621… · /containers/cna/references/3

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.

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