| Title | makeplane plane <=1.4.2 Use of Less Trusted Source |
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| Description | Plane exposes multiple unauthenticated API endpoints that return distinguishable responses depending on whether a supplied email address belongs to a registered user. An AuthenticationThrottle (DRF AnonRateThrottle) rate-limits these endpoints, but the throttle key is derived from the X-Forwarded-For header without requiring a trusted proxy configuration (NUM_PROXIES is unset). An unauthenticated attacker can rotate the X-Forwarded-For value to bypass the rate limit and enumerate registered email addresses at arbitrary speed. |
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| Source | ⚠️ https://github.com/makeplane/plane/issues/9913 |
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| User | ZAST.AI (UID 87884) |
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| Submission | 09/29/2026 11:22 (24 days ago) |
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| Moderation | 10/17/2026 11:31 (18 days later) |
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| Status | Accepted |
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| VulDB entry | 421581 [makeplane up to 1.4.2 API Endpoint X-Forwarded-For reliance on untrusted inputs in a security decision] |
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| Points | 20 |
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