CVE-2026-87830

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. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://lists.apache.org/thread.html/lwlozb1x20d16f9dnyvoygc9rrhzq2vn	Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/09/30/9	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:apache:wss4j::::::::
	cpe:2.3:a:apache:wss4j::::::::
	cpe:2.3:a:apache:wss4j::::::::

History

06 Oct 2026, 17:26

Type	Values Removed	Values Added
References	~~() https://lists.apache.org/thread.html/lwlozb1x20d16f9dnyvoygc9rrhzq2vn -~~	() https://lists.apache.org/thread.html/lwlozb1x20d16f9dnyvoygc9rrhzq2vn - Vendor Advisory
References	~~() http://www.openwall.com/lists/oss-security/2026/09/30/9 -~~	() http://www.openwall.com/lists/oss-security/2026/09/30/9 - Mailing List, Third Party Advisory
CPE		cpe:2.3:a:apache:wss4j::::::::
First Time		Apache Apache wss4j

30 Sep 2026, 20:17

Type	Values Removed	Values Added
CWE		CWE-917
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.1

30 Sep 2026, 13:17

Type	Values Removed	Values Added
References		() http://www.openwall.com/lists/oss-security/2026/09/30/9 -

30 Sep 2026, 12:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-30 12:17

Updated : 2026-10-06 17:26

NVD link : CVE-2026-87830

Mitre link : CVE-2026-87830

CVE.ORG link : CVE-2026-87830

JSON object : View

Products Affected

apache

wss4j

CWE

CWE-917

Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')

{"id": "CVE-2026-87830", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-87830", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-09-30T19:46:48.561887Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security@apache.org", "affectedData": [{"vendor": "Apache Software Foundation", "product": "Apache WSS4J", "versions": [{"status": "affected", "version": "4.0.0", "lessThan": "4.0.2", "versionType": "semver"}, {"status": "affected", "version": "3.0.0", "lessThan": "3.0.6", "versionType": "semver"}, {"status": "affected", "version": "0", "lessThan": "2.4.4", "versionType": "semver"}], "packageURL": "pkg:maven/org.apache.wss4j/wss4j-ws-security-policy-stax", "packageName": "org.apache.wss4j:wss4j-ws-security-policy-stax", "collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected"}]}], "published": "2026-09-30T12:17:14.087", "references": [{"url": "https://lists.apache.org/thread.html/lwlozb1x20d16f9dnyvoygc9rrhzq2vn", "tags": ["Vendor Advisory"], "source": "security@apache.org"}, {"url": "http://www.openwall.com/lists/oss-security/2026/09/30/9", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-917"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-10-06T17:26:47.927", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:apache:wss4j:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A3409718-5467-407D-9B51-14E58B6D2F68", "versionEndExcluding": "2.4.4"}, {"criteria": "cpe:2.3:a:apache:wss4j:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "31AFF243-7BCE-44BC-85C5-6FE257642C13", "versionEndExcluding": "3.0.6", "versionStartIncluding": "3.0.0"}, {"criteria": "cpe:2.3:a:apache:wss4j:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "20E76C98-444D-4DB5-91E0-90E84C196158", "versionEndExcluding": "4.0.2", "versionStartIncluding": "4.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@apache.org"}