CVE-2026-92899
Apache WSS4J: UsernameToken replay protection bypassed by re-encoding the Nonce
Description
Apache WSS4J remembers the Nonce of each UsernameToken it accepts, so a captured token cannot be reused. It stored the Nonce as raw base64 text, but authentication decodes that text and uses the bytes.The same bytes can be written as base64 in several ways. An attacker who captured an authenticated request could re-send it with a space added to the Nonce: the password digest still verified, but the token no longer matched the remembered one, so the replay was accepted. Since a UsernameToken does not cover the message body, the captured token could then be reused on requests of the attacker's choosing until it expired. Affects deployments with a nonce replay cache configured, as Apache CXF has by default, and only tokens using a password digest. The cache is now keyed on the decoded Nonce. 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, 1:17 p.m.
Last Modified :
Oct. 2, 2026, 8:18 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 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade to Apache WSS4J version 4.0.2.
- Upgrade to Apache WSS4J version 3.0.6.
- Upgrade to Apache WSS4J version 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-2026-92899.
| URL | Resource |
|---|---|
| https://lists.apache.org/thread.html/nrzngsz1xm2lztq3t873663xx9wnrwm7 | Mailing List Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/09/30/13 | 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-2026-92899 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-2026-92899
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-2026-92899 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-92899 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. 02, 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/nrzngsz1xm2lztq3t873663xx9wnrwm7 Types: Mailing List, Vendor Advisory Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/09/30/13 Types: Mailing List, Third Party Advisory -
New CVE Received by [email protected]
Sep. 30, 2026
Action Type Old Value New Value Added Description Apache WSS4J remembers the Nonce of each UsernameToken it accepts, so a captured token cannot be reused. It stored the Nonce as raw base64 text, but authentication decodes that text and uses the bytes.The same bytes can be written as base64 in several ways. An attacker who captured an authenticated request could re-send it with a space added to the Nonce: the password digest still verified, but the token no longer matched the remembered one, so the replay was accepted. Since a UsernameToken does not cover the message body, the captured token could then be reused on requests of the attacker's choosing until it expired. Affects deployments with a nonce replay cache configured, as Apache CXF has by default, and only tokens using a password digest. The cache is now keyed on the decoded Nonce. 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/2026/92xxx/CVE-2026-92899.json">CVE-2026-92899</a> Added Reference https://lists.apache.org/thread.html/nrzngsz1xm2lztq3t873663xx9wnrwm7 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 30, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N Added CWE CWE-290 Added SSVC {'id': 'CVE-2026-92899', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-30T12:49:54.166060Z'} -
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/2026/09/30/13