Possibility for anyone to add a stack with existing tasks on anyone's board in Nextcloud Deck

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• nextcloud deckbefore 1.4.8
• nextcloud deck1.5.0 and later · before 1.5.6
• nextcloud deck1.6.0 and later · before 1.6.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

• nextcloud security-advisories

  • < 1.4.8, >= 1.5.0, < 1.5.6, = 1.6.0affected

Other highest-scoring records for the same primary product.

• CVE-2021-39225Missing permission check on Deck API
  32Monitor
• CVE-2020-8182Improper access control in Nextcloud Deck 0.8.0 allowed an attacker to reshare boards shared with them with more permissions than they had t
  32Monitor
• CVE-2023-22470Nextcloud Deck vulnerable to uncontrolled resource consumption
  26Monitor
• CVE-2021-37631Circle can be accessed by non-Circle members in Nextcloud Deck
  26Monitor
• CVE-2021-22913Nextcloud Deck before 1.2.7, 1.4.1 suffers from an information disclosure vulnerability when searches for sharees utilize the lookup server
  26Monitor
• CVE-2025-66548Nextcloud Deck app allows to spoof file extensions by using RTLO characters
  22Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

The endpoint fetches the record by the ID sent in the request, but never checks whether the record belongs to the requesting user.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1const invoice = await Invoice.findById(req.params.id);2res.json(invoice);

1const invoice = await Invoice.findOne({2  id: req.params.id,3  ownerId: req.user.id,4});5if (!invoice) return res.sendStatus(404);6res.json(invoice);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.