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TI-2026-35226 Aliases CVE-2026-47725GHSA-273q-qgh5-wrj6

nebula-mesh: Web UI lacks CSRF tokens on /ui/* mutating endpoints

Priority HIGH 70CWE-352Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Tampering, Privilege escalation
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-352 and CWE-269.

Summary

nebula-mesh is a self-hosted control plane for Slack Nebula mesh virtual private network. Prior to version 0.3.3, every /ui/* POST / PUT / PATCH / DELETE route processes the request as soon as the session cookie validates. SameSite=Lax on the session cookie prevents most cross-site form submits but does not protect: top-level form-submit navigations from third-party pages (some browsers still send Lax cookies on top-level POSTs); same-registrable-domain attackers (sibling-subdomain XSS, subdomain takeover); the GET /ui/logout route, which a third-party <img src=".../ui/logout"> can force-trigger. This issue has been patched in version 0.3.3.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00187 8th percentileScored 2026-11-07
Fix Fixed nebula-mesh (juev): 0.3.3github.com/juev/nebula-mesh (Go): 0.3.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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
juevnebula-meshbefore 0.3.30.3.3Patch availableCNA
—github.com/juev/nebula-mesh (Go)before 0.3.30.3.3Patch availableGHSA-273q-qgh5-wrj6
  • nebula-mesh Vendorjuev Affected before 0.3.3 Fixed in 0.3.3 Patch available CNA
  • github.com/juev/nebula-mesh (Go) Vendor— Affected before 0.3.3 Fixed in 0.3.3 Patch available GHSA-273q-qgh5-wrj6

Remediation

  • Fix · CNA nebula-mesh (juev) Fixed in 0.3.3
  • Fix · GHSA-273q-qgh5-wrj6 github.com/juev/nebula-mesh (Go) Fixed in 0.3.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-47725
  2. 2026-10-03 Alias added: GHSA-273q-qgh5-wrj6

References

Other 4

  • TI-2026-35227 nebula-mesh: GET /api/v1/audit-log discloses all entries to any operator CVSS 4.0HIGH 7.1
  • TI-2026-35499 nebula-mesh: Session and OIDC state cookies lack the Secure attribute CVSS 4.0MEDIUM 4.6
  • TI-2026-35225 nebula-mesh: API endpoints lack ownership checks, enabling cross-operator privilege escalation CVSS 3.1CRITICAL 9.9
  • TI-2026-36454 Nebula Mesh: Web UI lacks ownership checks, enabling cross-operator access to hosts and networks (read, block, delete) CVSS 3.1HIGH 8.8
  • TI-2026-35223 nebula-mesh: Host advanced overrides allow YAML injection into agent config.yml CVSS 4.0HIGH 8.7
  • TI-2026-35468 nebula-mesh: Decrypted CA private key persists in heap after signing CVSS 4.0MEDIUM 6.9
See all 8 →

Sources

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