{"id":"CVE-2018-1000861","kind":"vulnerability","aliases":["CVE-2018-1000861"],"related":[],"title":"Jenkins Jenkins Stapler Web Framework: Jenkins Stapler Web Framework Deserialization of Untrusted Data Vulnerability","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.","summary":"The Stapler web framework used by Jenkins deserializes untrusted data, letting a remote request run code. An attacker who can reach the Jenkins web interface gets code execution on the Jenkins server.","severity":"critical","cvss":10.0,"epss":0.98326,"exploited":true,"exploited_at":"2022-02-10T00:00:00+00:00","products":[{"name":"Jenkins Jenkins Stapler Web Framework","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["ci-cd","exploited","jenkins","runtime","self-hosted"],"not_affected_if":["managed-hosting"],"how_to_check":null,"fix":"Apply the Jenkins and Stapler updates from the vendor advisory; the sources do not name the fixed version.","status":"open","published_at":"2018-12-10T14:29:01+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:28:55+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"runtime","confidence":0.7,"triage":{"at":"2026-10-23T21:28:55Z","model":"claude-haiku-5-5","output":{"fix":"Apply the Jenkins and Stapler updates from the vendor advisory; the sources do not name the fixed version.","reach":"internet","impact":"high","summary":"The Stapler web framework used by Jenkins deserializes untrusted data, letting a remote request run code. An attacker who can reach the Jenkins web interface gets code execution on the Jenkins server.","category":"runtime","who_cares":["jenkins","self-hosted","ci-cd"],"confidence":0.7,"needs_auth":"unknown","worst_case":"Attacker runs code on the Jenkins server remotely","analyst_note":"Find the fixed Jenkins/Stapler versions and detection steps in the Jenkins security advisory for CVE-2018-1000861; sources give none.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["managed-hosting"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000453,"input_tokens":2842,"output_tokens":338,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-1000861':17A,20A '-2018':16A,19A '2.138.3':84C '2.153':80C 'access':100C 'allow':90C 'attack':52B,91C 'cd':28B 'ci':27B 'ci-cd':26B 'code':50B,61B,68C 'craft':101C 'cve':15A,18A 'data':13A,44B 'deseri':10A,42B 'earlier':82C,86C 'execut':62B,69C 'exist':71C 'exploit':29B 'framework':5A,9A,25A,38B,76C 'get':60B 'host':34B 'intend':106C 'interfac':59B 'invok':93C,109C 'java':97C 'jenkin':1A,2A,6A,30B,41B,57B,65B,79C 'jenkins':21A,22A 'let':45B 'lts':83C 'method':95C 'object':98C 'reach':55B 'remot':47B 'request':48B 'run':49B 'runtim':31B 'self':33B 'self-host':32B 'server':66B 'stapler':3A,7A,23A,36B,74C 'stapler/core/src/main/java/org/kohsuke/stapler/metaclass.java':88C 'untrust':12A,43B 'url':102C 'use':39B,77C 'vulner':14A,70C 'way':111C 'web':4A,8A,24A,37B,58B,75C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2018-12-10T14:29:01+00:00","kev":{"dateAdded":"2022-02-10","dueDate":"2022-08-10","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2018-1000861","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-1000861","severity":null,"published_at":"2022-02-10T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:53+00:00","fetched_at":"2026-10-25T11:39:17+00:00","note":null},{"source":"epss","external_id":"CVE-2018-1000861","url":"https://api.first.org/data/v1/epss?cve=CVE-2018-1000861","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:44+00:00","fetched_at":"2026-10-23T19:13:44+00:00","note":null},{"source":"nvd","external_id":"CVE-2018-1000861","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-1000861","severity":null,"published_at":"2018-12-10T14:29:01+00:00","modified_at":"2026-06-17T01:33:11+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}