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Medium severity · published Oct 5, 2026
CVE-2026-104969
Plane: Cross-Tenant Cycle Issue Hijack via IDOR
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
Plane is an open-source project management tool. Prior to 1.4.0, the cycle-issues endpoint accepts issue UUIDs in the request body without validating that they belong to the caller's workspace. An authenticated user can add issues from any workspace to a cycle they control. If a victim issue is already assigned to a cycle, the operation removes it from the victim's cycle, causing a destructive cross-tenant write. This issue is fixed in 1.4.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PL
plane · makeplane
< 1.4.0 · source: vendor
Affected product
PL
plane
makeplane
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104969
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-104969
x_refsource_CONFIRM
https://github.com/makeplane/plane/security/advisories/GHSA-22g9-9xfv-q3fr
x_refsource_MISC
https://github.com/makeplane/plane/pull/9269
x_refsource_MISC
https://github.com/makeplane/plane/commit/81d9873d7f1cf1d1252ed53c12dd33696be73a89
x_refsource_MISC
https://github.com/makeplane/plane/releases/tag/v1.4.0
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