How severe is CVE-2026-13728?

CVE-2026-13728 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-13728 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-13728?

CVE-2026-13728 affects Watchguard Fireware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-13728?

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

When was CVE-2026-13728 published?

CVE-2026-13728 was published on 2026-07-03 and last updated on 2026-08-10.

CVE-2026-13728

CVE-2026-13728 is a medium-severity vulnerability in Watchguard Fireware with a CVSS 3.x base score of 4.4. 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-798.

Key facts

Severity: Medium (CVSS 3.x base score 4.4)
CVSS v4: 5.9
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Watchguard Fireware
Published: 2026-07-03
Last modified: 2026-08-10

Description

In exception circumstances, WatchGuard Fireware OS on a FireCluster may use a hard-coded encryption key to encrypt saved credentials for Access Portal resources. This vulnerability does not affect devices that do not support the Access Portal feature or standalone Fireboxes not deployed in a FireCluster.

Frequently asked questions

What is CVE-2026-13728?: In exception circumstances, WatchGuard Fireware OS on a FireCluster may use a hard-coded encryption key to encrypt saved credentials for Access Portal resources. This vulnerability does not affect devices that do not support the Access Portal feature or standalone Fireboxes not deployed in a FireCluster.
How severe is CVE-2026-13728?: CVE-2026-13728 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-13728 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-13728?: CVE-2026-13728 affects Watchguard Fireware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-13728?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-13728 published?: CVE-2026-13728 was published on 2026-07-03 and last updated on 2026-08-10.

References

Affected products (1)

cpe:2.3:o:watchguard:fireware:*:*:*:*:*:*:*:*

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