Apache WSS4J: UsernameToken replay protection bypassed by re-encoding the Nonce (CVE-2026-92899) | HOL Guard CVE

Medium · CVSS 4.8CVE-2026-92899

Apache WSS4J: UsernameToken replay protection bypassed by re-encoding the Nonce

Answer in brief

CVE-2026-92899 records a Medium severity (CVSS 4.8) vulnerability in Apache WSS4J: UsernameToken replay protection bypassed by re-encoding the Nonce. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/org.apache.wss4j:wss4j-ws-security-dom (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 30, 2026Updated Sep 30, 2026Source checked Sep 30, 2026First seen by HOL Sep 30, 2026Material review Sep 30, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.8
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 4.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/org.apache.wss4j:wss4j-ws-security-dom (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Apache Software Foundation/org.apache.wss4j:wss4j-ws-security-domgeneric	>=4.0.0 <4.0.2 \|\| >=3.0.0 <3.0.6 \|\| >=0 <2.4.4	4.0.2, 3.0.6, 2.4.4

Recommended response

Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/org.apache.wss4j:wss4j-ws-security-dom.
Review the reported fix. Update Apache Software Foundation/org.apache.wss4j:wss4j-ws-security-dom to 4.0.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 30, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 30, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.