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CVE-2026-59815: Joplin: Pending share recipients can write items into shared folders before accepting invitations

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-21 · updated 2026-09-24
• Weakness: CWE-863

Description

Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.7, Joplin Server's ItemModel.checkIfAllowed() authorizes writes to items with a share ID when any share_users row exists for the caller, without requiring ShareUserStatus.Accepted. A low-privileged authenticated user with a pending folder-share invitation can create an item under the share ID, and ShareModel.updateSharedItems3() propagates the injected content to the owner and accepted participants before the attacker accepts the invitation. This issue is fixed in version 3.7.7.

Affected products

• laurent22 joplin: before 3.7.7

References

• https://github.com/laurent22/joplin/commit/dff533ccbd2b300eac218a11a7619280865e2e9b
• https://github.com/laurent22/joplin/security/advisories/GHSA-qq59-gg3w-pf7v
• https://github.com/laurent22/joplin/security/advisories/GHSA-qq59-gg3w-pf7v

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