How severe is CVE-2026-15580?

CVE-2026-15580 has a CVSS 4.0 base score of 6.9, rated medium severity.

Is CVE-2026-15580 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-15580?

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

When was CVE-2026-15580 published?

CVE-2026-15580 was published on 2026-08-21.

CVE-2026-15580

CVE-2026-15580 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.9. 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-1385.

Key facts

Severity: Medium (CVSS 4.0 base score 6.9)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1385
Published: 2026-08-21
Last modified: 2026-08-21

Description

vault token disclosure via unvalidated postMessage vulnerability in N-able PassPortal allows Authentication Abuse. This issue affects the PassPortal browser extension: before 3.49.6.

Frequently asked questions

What is CVE-2026-15580?: vault token disclosure via unvalidated postMessage vulnerability in N-able PassPortal allows Authentication Abuse. This issue affects the PassPortal browser extension: before 3.49.6.
How severe is CVE-2026-15580?: CVE-2026-15580 has a CVSS 4.0 base score of 6.9, rated medium severity.
Is CVE-2026-15580 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-15580?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-15580 published?: CVE-2026-15580 was published on 2026-08-21.

References

https://me.n-able.com/s/security-advisory/aArVy0000002GQTKA2/cve202615580-vault-token-disclosure-via-unvalidated-postmessage

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