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CVE-2025-66546

Nextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.19, 5.5.6, and 6.0.1, the calendar app allowed blindly booking appointments with a squential ID without known the appointment token. This vulnerability is fixed in 4.7.19, 5.5.6, and 6.0.1.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d9a6d368b24abf9d7409646dd5c7b84b80b3c8c12da5d799643ab9e6ec65d74a
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":">= 6.0.0-rc.1, < 6.0.1"},{"status":"affected","version":">= 5.0.0-rc.1, < 5.5.6"},{"status":"affected","version":">= 3.0.0-beta1, < 4.7.19"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:ed00ba091001eaaac92dbd24e2116428dd656e3471183cb6092ead49f19ccc29 · sha256:294fe60d3d2fecd9… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":3.3,"baseSeverity":"LOW","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/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:ed00ba091001eaaac92dbd24e2116428dd656e3471183cb6092ead49f19ccc29 · sha256:294fe60d3d2fecd9… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-639","description":"CWE-639: Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:ed00ba091001eaaac92dbd24e2116428dd656e3471183cb6092ead49f19ccc29 · sha256:294fe60d3d2fecd9… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011326b3","tags":["x_refsource_MISC"],"url":"https://github.com/nextcloud/calendar/commit/f41650c3681fc4a4130eb883f5c0899c011326b3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ed00ba091001eaaac92dbd24e2116428dd656e3471183cb6092ead49f19ccc29 · sha256:294fe60d3d2fecd9… · /containers/cna/references/2
{"name":"https://github.com/nextcloud/calendar/pull/7537","tags":["x_refsource_MISC"],"url":"https://github.com/nextcloud/calendar/pull/7537"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ed00ba091001eaaac92dbd24e2116428dd656e3471183cb6092ead49f19ccc29 · sha256:294fe60d3d2fecd9… · /containers/cna/references/1
{"name":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2674-fj95","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7x2j-2674-fj95"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ed00ba091001eaaac92dbd24e2116428dd656e3471183cb6092ead49f19ccc29 · sha256:294fe60d3d2fecd9… · /containers/cna/references/0
{"name":"https://hackerone.com/reports/3275810","tags":["x_refsource_MISC"],"url":"https://hackerone.com/reports/3275810"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:ed00ba091001eaaac92dbd24e2116428dd656e3471183cb6092ead49f19ccc29 · sha256:294fe60d3d2fecd9… · /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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