Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2025-66511

Nextcloud Calendar is a calendar app for Nextcloud. Prior to 6.0.3, the Calendar app generates participant tokens for meeting proposals using a hash function, allowing an attacker to compute valid participant tokens, which allowed them to request details and submit dates in meeting proposals. The tokens are not purely random generated. This vulnerability is fixed in 6.0.3.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:bccb528c5a9b3b645c6c7f5bb16b89ba470465bad0822363429fa7719b915803
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, < 6.0.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:964882d8598cc3778c9af79ec37de7bd38893360f7fb21814e2fe70657696302 · sha256:3bad396ef2208d21… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.8,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:964882d8598cc3778c9af79ec37de7bd38893360f7fb21814e2fe70657696302 · sha256:3bad396ef2208d21… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-330","description":"CWE-330: Use of Insufficiently Random Values","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:964882d8598cc3778c9af79ec37de7bd38893360f7fb21814e2fe70657696302 · sha256:3bad396ef2208d21… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/nextcloud/calendar/commit/8de14ae87f321f5f09280d9895a27d54d24f33fb","tags":["x_refsource_MISC"],"url":"https://github.com/nextcloud/calendar/commit/8de14ae87f321f5f09280d9895a27d54d24f33fb"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:964882d8598cc3778c9af79ec37de7bd38893360f7fb21814e2fe70657696302 · sha256:3bad396ef2208d21… · /containers/cna/references/2
{"name":"https://github.com/nextcloud/calendar/pull/7659","tags":["x_refsource_MISC"],"url":"https://github.com/nextcloud/calendar/pull/7659"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:964882d8598cc3778c9af79ec37de7bd38893360f7fb21814e2fe70657696302 · sha256:3bad396ef2208d21… · /containers/cna/references/1
{"name":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-whm3-vv55-gf27","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-whm3-vv55-gf27"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:964882d8598cc3778c9af79ec37de7bd38893360f7fb21814e2fe70657696302 · sha256:3bad396ef2208d21… · /containers/cna/references/0
{"name":"https://hackerone.com/reports/3385434","tags":["x_refsource_MISC"],"url":"https://hackerone.com/reports/3385434"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:964882d8598cc3778c9af79ec37de7bd38893360f7fb21814e2fe70657696302 · sha256:3bad396ef2208d21… · /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.

← Back to CVE Explorer