What’s Vulnerable › Vulnerabilities

CVE-2026-104978: Plane: Invitation Hijack in Project Join Flow via Missing Authorization and Email-Only Acceptance

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-05 · updated 2026-10-07
• Weakness: CWE-863

Description

Plane is an open-source project management tool. Prior to 1.4.0, Plane's project invitation list endpoint is accessible to any authenticated user who knows the workspace slug and project ID, while the public project invitation join endpoint accepts an invitation based only on a submitted email address. When a pending invitation targets an email address that has not registered with Plane, an attacker can enumerate the invitation, register an account using the invited email without mailbox verification, and accept the invitation. The attacker-controlled account is then added to the target workspace and project. This issue is fixed in 1.4.0.

Affected products

• makeplane plane: before 1.4.0

References

• https://github.com/makeplane/plane/commit/14a4c22f94eac1582439e41112213f976c6a6cf7
• https://github.com/makeplane/plane/pull/9308
• https://github.com/makeplane/plane/releases/tag/v1.4.0
• https://github.com/makeplane/plane/security/advisories/GHSA-g36h-p63v-g9c7
• https://github.com/makeplane/plane/security/advisories/GHSA-g36h-p63v-g9c7

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