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TI-2026-28725 Aliases CVE-2026-39843

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

Priority HIGH 67CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-918 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00255 17th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed plane (makeplane): 1.3.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
makeplaneplane0.28.0 to before 1.3.01.3.0Patch availableCNA
  • plane Vendormakeplane Affected 0.28.0 to before 1.3.0 Fixed in 1.3.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:plane:plane:*:*:*:*:*:*:*:*0.28.0 to before 1.3.0Vulnerablemakeplane
  • cpe:2.3:a:plane:plane:*:*:*:*:*:*:*:* Versions 0.28.0 to before 1.3.0 Vulnerable ·makeplane

Remediation

  • Fix · CNA plane (makeplane) Fixed in 1.3.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-39843

References

Exploit 1

  • TI-2024-32097 Plane allows server side request forgery via /_next/image endpoint CVSS 3.1CRITICAL 9.3
  • TI-2026-34237 Authorization bypass in makeplane plane CVSS 3.1HIGH 8.3
  • TI-2023-02127 Plane v0.7.1 - Unauthorized access to files CVSS 3.1HIGH 7.5
  • TI-2026-28361 Plane IDOR: Cross-Project Issue Date Modification via Bulk Update Endpoint CVSS 3.1HIGH 7.7
  • TI-2023-14603 Plane 0.7.1 - Insecure file upload CVSS 3.1HIGH 7.1
  • TI-2026-09315 Plane 1.3.1 - Stored XSS in intake issue description_html CVSS 4.0MEDIUM 6.9
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences