How severe is CVE-2018-20595?

CVE-2018-20595 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-20595 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20595?

CVE-2018-20595 affects Hsweb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20595?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-20595 published?

CVE-2018-20595 was published on 2018-12-30 and last updated on 2026-06-17.

CVE-2018-20595

CVE-2018-20595 is a high-severity vulnerability in Hsweb with a CVSS 3.x base score of 8.8. 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-352.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Hsweb
Published: 2018-12-30
Last modified: 2026-06-17

Description

A CSRF issue was discovered in web/authorization/oauth2/controller/OAuth2ClientController.java in hsweb 3.0.4 because the state parameter in the request is not compared with the state parameter in the session after user authentication is successful.

Frequently asked questions

What is CVE-2018-20595?: A CSRF issue was discovered in web/authorization/oauth2/controller/OAuth2ClientController.java in hsweb 3.0.4 because the state parameter in the request is not compared with the state parameter in the session after user authentication is successful.
How severe is CVE-2018-20595?: CVE-2018-20595 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-20595 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20595?: CVE-2018-20595 affects Hsweb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20595?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-20595 published?: CVE-2018-20595 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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