CVE Explorer

CVE-2025-66550

Nextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.17 and 5.2.4, when a malicious user creates a calendar event with a crafted attachment that links to a download link of a file on the same Nextcloud server, the file would be downloaded without the user confirming the action. This vulnerability is fixed in 4.7.17 and 5.2.4.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:841fd1c8c0f4156a41c1f6c3555590ae974ea31e227d17bd29db155197f74438

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"security-advisories","vendor":"nextcloud","versions":[{"status":"affected","version":">= 5.0.0-rc.1, < 5.2.4"},{"status":"affected","version":"< 4.7.17"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:4825364067e58895f8cce12b9a524b62453a9856c1e36e57dfd8f76a541a6acc · sha256:b61c2f226a915523… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.7,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:4825364067e58895f8cce12b9a524b62453a9856c1e36e57dfd8f76a541a6acc · sha256:b61c2f226a915523… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-241","description":"CWE-241: Improper Handling of Unexpected Data Type","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:4825364067e58895f8cce12b9a524b62453a9856c1e36e57dfd8f76a541a6acc · sha256:b61c2f226a915523… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions

{"name":"https://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769","tags":["x_refsource_MISC"],"url":"https://github.com/nextcloud/calendar/commit/63a6c398db01391eb9fd5297a0d4c3d6e614f769"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:4825364067e58895f8cce12b9a524b62453a9856c1e36e57dfd8f76a541a6acc · sha256:b61c2f226a915523… · /containers/cna/references/2

{"name":"https://github.com/nextcloud/calendar/pull/6971","tags":["x_refsource_MISC"],"url":"https://github.com/nextcloud/calendar/pull/6971"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:4825364067e58895f8cce12b9a524b62453a9856c1e36e57dfd8f76a541a6acc · sha256:b61c2f226a915523… · /containers/cna/references/1

{"name":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv","tags":["x_refsource_CONFIRM"],"url":"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f29c-ppmv-8mcv"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:4825364067e58895f8cce12b9a524b62453a9856c1e36e57dfd8f76a541a6acc · sha256:b61c2f226a915523… · /containers/cna/references/0

{"name":"https://hackerone.com/reports/3112033","tags":["x_refsource_MISC"],"url":"https://hackerone.com/reports/3112033"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:4825364067e58895f8cce12b9a524b62453a9856c1e36e57dfd8f76a541a6acc · sha256:b61c2f226a915523… · /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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