How severe is CVE-2018-20594?

CVE-2018-20594 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-20594 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20594?

CVE-2018-20594 affects Hsweb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20594?

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

When was CVE-2018-20594 published?

CVE-2018-20594 was published on 2018-12-30 and last updated on 2026-06-17.

CVE-2018-20594

CVE-2018-20594 is a medium-severity vulnerability in Hsweb with a CVSS 3.x base score of 6.1. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Hsweb
Published: 2018-12-30
Last modified: 2026-06-17

Description

An issue was discovered in hsweb 3.0.4. It is a reflected XSS vulnerability due to the absence of type parameter checking in FlowableModelManagerController.java.

Frequently asked questions

What is CVE-2018-20594?: An issue was discovered in hsweb 3.0.4. It is a reflected XSS vulnerability due to the absence of type parameter checking in FlowableModelManagerController.java.
How severe is CVE-2018-20594?: CVE-2018-20594 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-20594 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20594?: CVE-2018-20594 affects Hsweb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20594?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-20594 published?: CVE-2018-20594 was published on 2018-12-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hsweb:hsweb:3.0.4:*:*:*:*:*:*:*

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