CVE-2026-39843

Plane has a Server-Side Request Forgery (SSRF) in Favicon Fetching

State: Published
Severity: 7.7 High
Published: Apr 9, 2026
Updated: Apr 13, 2026
Reserved: Apr 7, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.7 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Product	Versions
planemakeplane	>= 0.28.0, < 1.3.0Affected

References

https://github.com/makeplane/plane/security/advisories/GHSA-9fr2-pprw-pp9j

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