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CVE-2026-39843

HIGH CVSS 3.1: 7.7 EPSS 0.03%
Updated Apr 17, 2026
Plane
Parameter Value
CVSS 7.7 (HIGH)
Affected Versions 0.28.0 — 1.3.0
Fixed In 1.3.0
Type CWE-918 (Server-Side Request Forgery (SSRF))
Vendor Plane
Public PoC No

Plane is an an open-source project management tool. From 0.28.0 to before 1.3.0, the remediation of GHSA-jcc6-f9v6-f7jw is incomplete which could lead to the same full read Server-Side Request Forgery when a normal html page contains a link tag with an href that redirects to a private IP address is supplied to Add link by an authenticated attacker with low privileges. Redirects for the main page URL are validated, but not the favicon fetch path. fetch_and_encode_favicon() still uses requests.get(favicon_url, ...) with the default redirect-following.

This vulnerability is fixed in 1.3.0.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Plane Plane
cpe:2.3:a:plane:plane:*:*:*:*:*:*:*:*
0.28.0 1.3.0

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