How severe is CVE-2017-12158?

CVE-2017-12158 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2017-12158 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-12158?

CVE-2017-12158 primarily affects Redhat Single Sign On. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-12158?

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

When was CVE-2017-12158 published?

CVE-2017-12158 was published on 2017-10-26 and last updated on 2026-06-17.

CVE-2017-12158

CVE-2017-12158 is a medium-severity vulnerability in Redhat Single Sign On with a CVSS 3.x base score of 5.4. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Redhat Single Sign On
Published: 2017-10-26
Last modified: 2026-06-17

Description

It was found that Keycloak would accept a HOST header URL in the admin console and use it to determine web resource locations. An attacker could use this flaw against an authenticated user to attain reflected XSS via a malicious server.

Frequently asked questions

What is CVE-2017-12158?: It was found that Keycloak would accept a HOST header URL in the admin console and use it to determine web resource locations. An attacker could use this flaw against an authenticated user to attain reflected XSS via a malicious server.
How severe is CVE-2017-12158?: CVE-2017-12158 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2017-12158 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-12158?: CVE-2017-12158 primarily affects Redhat Single Sign On. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2017-12158?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-12158 published?: CVE-2017-12158 was published on 2017-10-26 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:redhat:single_sign_on:7.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:single_sign_on:7.1:*:*:*:*:*:*:*
cpe:2.3:a:keycloak:keycloak:-:*:*:*:*:*:*:*

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