How severe is CVE-2018-1000861?

CVE-2018-1000861 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-1000861 being actively exploited?

Yes. CVE-2018-1000861 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-02-10, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2018-1000861?

CVE-2018-1000861 primarily affects Jenkins. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-1000861?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2018-1000861 have an EU (EUVD) identifier?

Yes. CVE-2018-1000861 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2022-4161. It is also flagged as exploited in the EUVD (since 2022-02-10).

When was CVE-2018-1000861 published?

CVE-2018-1000861 was published on 2018-12-10 and last updated on 2026-06-17.

CVE-2018-1000861

CVE-2018-1000861 is a critical-severity vulnerability in Jenkins with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-02-10). The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 98% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-02-10)
EU (EUVD) id: EUVD-2022-4161
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-02-10)
Weakness: CWE-502
Affected product: Jenkins
Published: 2018-12-10
Last modified: 2026-06-17

Description

A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153 and earlier, LTS 2.138.3 and earlier in stapler/core/src/main/java/org/kohsuke/stapler/MetaClass.java that allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way.

Frequently asked questions

What is CVE-2018-1000861?: A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153 and earlier, LTS 2.138.3 and earlier in stapler/core/src/main/java/org/kohsuke/stapler/MetaClass.java that allows attackers to invoke some methods on Java objects by accessing crafted URLs that were not intended to be invoked this way.
How severe is CVE-2018-1000861?: CVE-2018-1000861 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-1000861 being actively exploited?: Yes. CVE-2018-1000861 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-02-10, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2018-1000861?: CVE-2018-1000861 primarily affects Jenkins. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-1000861?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2018-1000861 have an EU (EUVD) identifier?: Yes. CVE-2018-1000861 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2022-4161. It is also flagged as exploited in the EUVD (since 2022-02-10).
When was CVE-2018-1000861 published?: CVE-2018-1000861 was published on 2018-12-10 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*
cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:3.11:*:*:*:*:*:*:*

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