CVE-2026-39843— Plane has a Server-Side Request Forgery (SSRF) in Favicon Fetching
Quick assessment
Affected
makeplane plane
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Plane是Plane开源的一个开源、自托管的项目规划工具。 Plane 0.28.0至1.3.0之前版本存在代码问题漏洞，该漏洞源于favicon获取路径未验证重定向，可能导致低权限认证攻击者通过包含指向私有IP地址链接标签的HTML页面，引发完整的服务器端请求伪造攻击。
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I. Basic Information for CVE-2026-39843
Vulnerability Information
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Vulnerability Title
Plane has a Server-Side Request Forgery (SSRF) in Favicon Fetching
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Plane 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Plane是Plane开源的一个开源、自托管的项目规划工具。 Plane 0.28.0至1.3.0之前版本存在代码问题漏洞，该漏洞源于favicon获取路径未验证重定向，可能导致低权限认证攻击者通过包含指向私有IP地址链接标签的HTML页面，引发完整的服务器端请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-39843
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-39843 (1)
IV. Related Vulnerabilities
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Same vendor: makeplane
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CVE-2026-86174
Plane through 1.4.2 Arbitrary Comment Write via Public Deplo -
CVE-2026-46558
Plane: Cross-workspace asset authorization bypass lets any a -
CVE-2026-40102
Plane: ORM Field Reference Injection via `segment` Parameter -
CVE-2026-27949
Plane Exposes User Email (PII and part of credential) in GET -
CVE-2026-39374
Plane IDOR: Cross-Project Issue Date Modification via Bulk U
Same weakness: CWE-918
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OpenAM before 16.1.3 SSRF via OpenID Connect Client jwks_uri -
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UTMStack < 11.2.16 Server-Side Request Forgery via downloadP -
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V. Comments for CVE-2026-39843
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