CVE-2018-1000861: Jenkins Stapler Web Framework Deserialization of Untrusted Data Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 10 Feb 2022, 1,158 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 98.3%
EPSS score, percentile 99.9 of all scored records
- How severe?
- 9.8 Critical
CVSS v3.1 base score, from CISA's enrichment of the record
- What should I do?
Required action (CISA), due 10 Aug 2022: Apply updates per vendor instructions.
- Which versions are affected?
Not stated. The CVE record gives vendor and product as “n/a” and the version as “unspecified”.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
What to do
Required action, set by CISA
Apply updates per vendor instructions.
CISA due date for this action: 10 August 2022.
Advisories and patches
Linked from CISA's catalog entry
Affected products and versions
The CVE record does not name affected products or versions: vendor and product are “n/a” and the version is “unspecified”.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
About this vulnerability
A code execution vulnerability exists in the Stapler web framework used by Jenkins
Summary: CISA's KEV catalog, as of 28 Oct 2026.
- CISA added CVE-2018-1000861 to its Known Exploited Vulnerabilities (KEV) catalog on 10 Feb 2022.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 10 Aug 2022.
- The CVE record was published on 10 Dec 2018, 1,158 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), taken from CISA's enrichment of the record.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 98.3% (percentile 99.9), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.
Weakness
- CWE-502: Deserialization of Untrusted Data
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| 10 Dec 2018 | CVE record published |
| 10 Feb 2022 | Added to CISA KEV |
| 10 Aug 2022 | CISA due date for the required action |
| 21 Oct 2025 | CVE record last updated |
References
More exploited Jenkins vulnerabilities
- CVE-2017-1000353: Jenkins Remote Code Execution Vulnerability
- CVE-2024-23897: Jenkins Command Line Interface (CLI) Path Traversal Vulnerability
- CVE-2015-5317: Jenkins User Interface (UI) Information Disclosure Vulnerability
- CVE-2019-1003029: Jenkins Script Security Plugin Sandbox Bypass Vulnerability
- CVE-2019-1003030: Jenkins Matrix Project Plugin Remote Code Execution Vulnerability