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CVE-2024-37887— Nextcloud Server's events information leaked with shared calendars on recurrence exceptions

Quick assessment

Affected
nextcloud security-advisories
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud Server存在安全漏洞，该漏洞源于共享者可以读取私人共享日历事件的重复例外情况。

CVSS 3.5 · Low EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2024-37887

Vulnerability Information
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Vulnerability Title
Nextcloud Server's events information leaked with shared calendars on recurrence exceptions
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud Server is a self hosted personal cloud system. Private shared calendar events' recurrence exceptions can be read by sharees. It is recommended that the Nextcloud Server is upgraded to 27.1.10 or 28.0.6 or 29.0.1 and that the Nextcloud Enterprise Server is upgraded to 27.1.10 or 28.0.6 or 29.0.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud Server存在安全漏洞，该漏洞源于共享者可以读取私人共享日历事件的重复例外情况。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nextcloud security-advisories >= 27.0.0, < 27.1.10 -

II. Public POCs for CVE-2024-37887

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III. Intelligence Information for CVE-2024-37887

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Patches & Fixes for CVE-2024-37887 (1)

Vendor Advisories for CVE-2024-37887 (1)

Other References for CVE-2024-37887 (1)

Same Patch Batch · nextcloud · 2024-06-14 · 12 CVEs total

CVE-2024-37882 8.1 HIGH Nextcloud Server can reshare read&share only folder with more permissions
CVE-2024-37313 7.3 HIGH Nextcloud server allows the by-pass the second factor
CVE-2024-37312 6.3 MEDIUM Nextcloud user_oidc app's ID4me feature is available even when disabled
CVE-2024-37886 5.4 MEDIUM Nextcloud user_oidc's ID4me does not validate signature or expiration
CVE-2024-37316 4.6 MEDIUM Nextcloud Calendar's event create can create attachments that link to other websites
CVE-2024-37317 4.6 MEDIUM Nextcloud Notes app can be tricked into using a received share created before the user log
CVE-2024-37883 4.3 MEDIUM Nextcloud Deck can access comments and attachments of deleted cards
CVE-2024-37885 3.8 LOW Code injection in Nextcloud Desktop Client for macOS
CVE-2024-37314 3.5 LOW Nextcloud Photos' shared albums have no restriction on photo removal
CVE-2024-37315 3.5 LOW Nextcloud Server's read-only users can restore old versions
CVE-2024-37884 3.5 LOW Nextcloud Server's users can delete old versions of read-only shared files

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-284

V. Comments for CVE-2024-37887

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