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TI-2022-13175 Aliases CVE-2022-31131

Ownership check missing when updating or deleting mail attachments in Nextcloud mail

Priority MEDIUM 58CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

Nextcloud mail is a Mail app for the Nextcloud home server product. Versions of Nextcloud mail prior to 1.12.2 were found to be missing user account ownership checks when performing tasks related to mail attachments. Attachments may have been exposed to incorrect system users. It is recommended that the Nextcloud Mail app is upgraded to 1.12.2. There are no known workarounds for this issue. ### Workarounds No workaround available ### References * [Pull request](https://github.com/nextcloud/mail/pull/6600) * [HackerOne](https://hackerone.com/reports/1579820) ### For more information If you have any questions or comments about this advisory: * Create a post in [nextcloud/security-advisories](https://github.com/nextcloud/security-advisories/discussions) * Customers: Open a support ticket at [support.nextcloud.com](https://support.nextcloud.com)

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00779 56th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed security-advisories (nextcloud): 1.12.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nextcloudsecurity-advisoriesbefore 1.12.21.12.2Patch availableCNA
  • security-advisories Vendornextcloud Affected before 1.12.2 Fixed in 1.12.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:nextcloud_mail:*:*:*:*:*:*:*:*before 1.12.2Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:nextcloud_mail:*:*:*:*:*:*:*:* Versions before 1.12.2 Vulnerable ·nextcloud

Remediation

  • Fix · CNA security-advisories (nextcloud) Fixed in 1.12.2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2022-31131

References

Exploit 1

Patch 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences