CVE-2026-39843: CWE-918: Server-Side Request Forgery (SSRF) in makeplane plane
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.
AI Analysis
Technical Summary
Plane versions >= 0.28.0 and < 1.3.0 contain an SSRF vulnerability (CWE-918) due to incomplete remediation of a prior issue (GHSA-jcc6-f9v6-f7jw). While redirects for the main page URL are validated, the favicon fetch path is not, allowing an attacker with low privileges to supply a malicious HTML page containing a link tag with an href that redirects to internal/private IP addresses. The fetch_and_encode_favicon() function uses requests.get() with default redirect-following, enabling SSRF. This vulnerability is resolved in version 1.3.0.
Potential Impact
An authenticated attacker with low privileges can exploit this SSRF vulnerability to cause the server to make HTTP requests to internal or private IP addresses. This can lead to unauthorized reading of internal resources. The vulnerability does not impact integrity or availability but has high confidentiality impact as per the CVSS vector.
Mitigation Recommendations
This vulnerability is fixed in Plane version 1.3.0. Users should upgrade to version 1.3.0 or later to remediate this issue. There is no vendor advisory content provided, but the description explicitly states the fix is in 1.3.0. Until upgraded, the vulnerability remains present. No additional mitigations are specified.
CVE-2026-39843: CWE-918: Server-Side Request Forgery (SSRF) in makeplane plane
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Plane versions >= 0.28.0 and < 1.3.0 contain an SSRF vulnerability (CWE-918) due to incomplete remediation of a prior issue (GHSA-jcc6-f9v6-f7jw). While redirects for the main page URL are validated, the favicon fetch path is not, allowing an attacker with low privileges to supply a malicious HTML page containing a link tag with an href that redirects to internal/private IP addresses. The fetch_and_encode_favicon() function uses requests.get() with default redirect-following, enabling SSRF. This vulnerability is resolved in version 1.3.0.
Potential Impact
An authenticated attacker with low privileges can exploit this SSRF vulnerability to cause the server to make HTTP requests to internal or private IP addresses. This can lead to unauthorized reading of internal resources. The vulnerability does not impact integrity or availability but has high confidentiality impact as per the CVSS vector.
Mitigation Recommendations
This vulnerability is fixed in Plane version 1.3.0. Users should upgrade to version 1.3.0 or later to remediate this issue. There is no vendor advisory content provided, but the description explicitly states the fix is in 1.3.0. Until upgraded, the vulnerability remains present. No additional mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-07T19:13:20.377Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d7ce5e1cc7ad14dae8f91f
Added to database: 4/9/2026, 4:05:50 PM
Last enriched: 4/17/2026, 11:54:13 AM
Last updated: 5/24/2026, 7:19:21 PM
Views: 80
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