High severity · published Oct 14, 2026
CVE-2026-110623
Papermerge Core through 3.5.3 Missing Authorization in Shared Nodes API
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
Papermerge Core through 3.5.3 contains a missing authorization vulnerability in the shared nodes API that allows authenticated users to share other users' documents by supplying arbitrary node UUIDs. Attackers can call POST /shared-nodes or PATCH /shared-nodes/access/{node_id} to grant themselves any role, then read, modify, or delete victims' documents and revoke existing shares.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
papermerge-core · papermerge
through 3.5.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-110623
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-110623
issue-tracking
https://github.com/papermerge/papermerge-core/issues/1290
issue-tracking
https://github.com/papermerge/papermerge-core/issues/1291
technical-description
https://github.com/papermerge/papermerge-core/blob/3.5.3/papermerge/core/features/shared_nodes/router.py#L78-L150
patch
https://github.com/papermerge/papermerge-core/commit/0fd469102b05b5ebeb5ee39b3f73ff76991ab269
third-party-advisory
https://www.vulncheck.com/advisories/papermerge-core-through-3.5.3-missing-authorization-in-shared-nodes-api
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