Vulnerability Details CVE-2026-39843
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 8.9%
CVSS Severity
CVSS v3 Score 7.7
Products affected by CVE-2026-39843
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cpe:2.3:a:plane:plane:0.28.0
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cpe:2.3:a:plane:plane:1.0.0
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cpe:2.3:a:plane:plane:1.1.0
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cpe:2.3:a:plane:plane:1.2.0
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cpe:2.3:a:plane:plane:1.2.1