CVE-2026-48058

nebula-mesh is a self-hosted control plane for Slack Nebula mesh virtual private network. Prior to version 0.3.2, internal/web/session.go and internal/web/oidc.go set HttpOnly and SameSite=Lax on every cookie but never Secure. A single plaintext request to the origin (operator on a LAN, mistyped URL, HTTP→HTTPS not strictly enforced, reverse proxy misconfiguration) discloses the session. This issue has been patched in version 0.3.2.

CVSS v4.0

4.6 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v4.0

4.6 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U

EPSS

0.19% chance of exploitation in the next 30 days, 9th percentile

Published

2026-07-28

Proof-of-concept exploits (1)

• advisories/GHSA-rqfj-vv8r-xhqc

References

• CVE Record
• NVD entry

Related

• CVE-2026-48053
• CVE-2026-48060
• CVE-2026-48051
• CVE-2026-48095
• CVE-2026-48039
• CVE-2026-4810