How severe is CVE-2026-48058?

CVE-2026-48058 has a CVSS 4.0 base score of 4.6, rated medium severity.

Is CVE-2026-48058 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-48058?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-48058 published?

CVE-2026-48058 was published on 2026-07-28 and last updated on 2026-07-30.

CVE-2026-48058

CVE-2026-48058 is a medium-severity vulnerability with a CVSS 4.0 base score of 4.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-614.

Key facts

Severity: Medium (CVSS 4.0 base score 4.6)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-614
Published: 2026-07-28
Last modified: 2026-07-30

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-48058?: CVE-2026-48058 has a CVSS 4.0 base score of 4.6, rated medium severity.
Is CVE-2026-48058 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-48058?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-48058 published?: CVE-2026-48058 was published on 2026-07-28 and last updated on 2026-07-30.

References

Other CWE-614 vulnerabilities

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CVE-2025-53757 — High (CVSS 8.7): This vulnerability exists in Digisol DG-GR6821AC Router due to misconfiguration of both Secure and HttpOnly flags on…
CVE-2025-0479 — High (CVSS 8.6): This vulnerability exists in the CP Plus Router due to insecure handling of cookie flags used within its web interface.…
CVE-2024-2493 — High (CVSS 7.5): Session Hijacking vulnerability in Hitachi Ops Center Analyzer.This issue affects Hitachi Ops Center Analyzer: from…

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