CVE-2026-87830
Apache WSS4J: Streaming WS-SecurityPolicy validation may skip element-protection checks.
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. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.
INFO
Published Date :
Sept. 30, 2026, 12:17 p.m.
Last Modified :
Oct. 6, 2026, 5:26 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade to StAX 4.0.2.
- Upgrade to StAX 3.0.6.
- Upgrade to StAX 2.4.4.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-87830.
| URL | 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-87830 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-87830
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-87830 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-87830 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Oct. 06, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:apache:wss4j:*:*:*:*:*:*:*:* versions up to (excluding) 2.4.4 *cpe:2.3:a:apache:wss4j:*:*:*:*:*:*:*:* versions from (including) 3.0.0 up to (excluding) 3.0.6 *cpe:2.3:a:apache:wss4j:*:*:*:*:*:*:*:* versions from (including) 4.0.0 up to (excluding) 4.0.2 Added Reference Type Apache Software Foundation: https://lists.apache.org/thread.html/lwlozb1x20d16f9dnyvoygc9rrhzq2vn Types: Vendor Advisory Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/09/30/9 Types: Mailing List, Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 30, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Added CWE CWE-917 Added SSVC {'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'} -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Sep. 30, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/09/30/9 -
New CVE Received by [email protected]
Sep. 30, 2026
Action Type Old Value New Value Added 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. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/87xxx/CVE-2026-87830.json">CVE-2026-87830</a> Added Reference https://lists.apache.org/thread.html/lwlozb1x20d16f9dnyvoygc9rrhzq2vn