CVE-2024-37316 — Nextcloud Calendar is a calendar app for Nextcloud

Nextcloud Calendar is a calendar app for Nextcloud. Authenticated users could create an event with manipulated attachment data leading to a bad redirect for participants when clicked. It is recommended that the Nextcloud Calendar App is upgraded to 4.6.8 or 4.7.2.

01What is this vulnerability?

Nextcloud Calendar is a calendar app for Nextcloud. Authenticated users could create an event with manipulated attachment data leading to a bad redirect for participants when clicked. It is recommended that the Nextcloud Calendar App is upgraded to 4.6.8 or 4.7.2.

02Affected products

Vendor	Product	Versions
nextcloud	security	advisories — >= 4.3.0, < 4.6.8, >= 4.7.0, < 4.7.2

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2024-06-14T15:23:12.705Z
• Last modified: 2024-08-02T03:50:56.106Z

09References

• github.com — https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2r7q-v…
• github.com — https://github.com/nextcloud/calendar/pull/5966
• hackerone.com — https://hackerone.com/reports/2457588