{"schemaVersion":3,"id":"CVE-2026-87830","aliases":["UBUNTU-CVE-2026-87830","DEBIAN-CVE-2026-87830"],"status":"published","duplicateOf":null,"title":null,"description":"In the StAX streaming WS-SecurityPolicy validator, certain relative or unsupported XPath expressions can be converted into paths that never match the actual XML element path. A remote SOAP peer may therefore send a required element without the expected signature or encryption.\nUsers are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.","dates":{"published":"2026-09-30T11:57:01.017Z","modified":"2026-09-30T19:47:41.782Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.1,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":10,"impact":8.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":10,"impact":8.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00213,"percentile":0.10941,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-01T00:00:00.000Z","score":0.00281,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00213,"percentile":0.10941}],"last30":[{"date":"2026-10-01T00:00:00.000Z","score":0.00281,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00184,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00213,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00213,"percentile":0.10941}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-917","name":"Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')","description":"The product constructs all or part of an expression language (EL) statement in a framework such as a Java Server Page (JSP) using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended EL statement before it is executed.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/917.html"}],"affected":[{"vendor":"apache software foundation","product":"apache wss4j","name":"Apache WSS4J","label":"apache wss4j","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.0.0, < 4.0.2","noFixRecorded":false,"fixedIn":null},{"text":"≥ 3.0.0, < 3.0.6","noFixRecorded":false,"fixedIn":null},{"text":"< 2.4.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.0.0, < 4.0.2 | ≥ 3.0.0, < 3.0.6 | < 2.4.4","eol":null,"hubHref":"/vendor/apache_software_foundation/apache_wss4j"},{"vendor":"apache","product":"wss4j","name":"wss4j","label":"wss4j","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 2.4.4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 3.0.0, < 3.0.6","noFixRecorded":false,"fixedIn":null},{"text":"≥ 4.0.0, < 4.0.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.4.4 | ≥ 3.0.0, < 3.0.6 | ≥ 4.0.0, < 4.0.2","eol":null,"hubHref":"/vendor/apache/wss4j"},{"vendor":"debian","product":"wss4j","name":"wss4j","label":"wss4j","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/wss4j","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"wss4j","name":"wss4j","label":"wss4j","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/wss4j","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://lists.apache.org/thread.html/lwlozb1x20d16f9dnyvoygc9rrhzq2vn","label":"lists.apache.org/thread.html/lwlozb1x20d16f9dnyvoygc9rrhzq2vn","hostname":"lists.apache.org","tags":["Vendor Advisory","REPORT"]},{"url":"http://www.openwall.com/lists/oss-security/2026/09/30/9","label":"www.openwall.com/lists/oss-security/2026/09/30/9","hostname":"www.openwall.com","tags":["REPORT","Mailing List","Third Party Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-87830","label":"ubuntu.com/security/CVE-2026-87830","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-87830","label":"www.cve.org/CVERecord?id=CVE-2026-87830","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-87830","label":"security-tracker.debian.org/tracker/CVE-2026-87830","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-30T11:57:01.017Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-30T19:47:41.782Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T21:36:10.280Z","stale":false,"partial":false}}