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CVE-2026-92899— Apache WSS4J: UsernameToken replay protection bypassed by re-encoding the Nonce

Quick assessment

Affected
Apache Software Foundation Apache WSS4J
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache WSS4J 会记录其接受的每个 UsernameToken 中的 Nonce（随机数），以防止捕获的令牌被重放。然而，它最初将 Nonce 以原始的 Base64 文本形式存储，而在认证过程中，系统会解码该文本并使用其对应的字节值。 由于相同的字节序列可以用多种不同的 Base64 编码方式表示，攻击者若捕获了一个已认证的请求，可以在重放该请求时向 Nonce 中添加一个空格。这样，密码摘要（password digest）仍然能够验证通过，但修改后的 Base64 文本与之前缓存中记录的原始 Non

AI Predicted 8.1 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token
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I. Basic Information for CVE-2026-92899

Vulnerability Information
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Vulnerability Title
Apache WSS4J: UsernameToken replay protection bypassed by re-encoding the Nonce
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache WSS4J 4.0.0 ~ 4.0.2 -

II. Public POCs for CVE-2026-92899

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III. Intelligence Information for CVE-2026-92899

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Other References for CVE-2026-92899 (1)

Same Patch Batch · Apache Software Foundation · 2026-09-30 · 19 CVEs total

CVE-2026-102508 9.2 CRITICAL Apache PLC4X: OPC UA secure channel: integrity bypass, unverifiable server certificate, an
CVE-2026-94052 9.1 CRITICAL Apache MINA SSHD: LDAP password authentication ineffective
CVE-2026-77185 9.1 CRITICAL Apache MINA SSHD: Asynchronous authentication can bypass signature verification
CVE-2026-94053 9.1 CRITICAL Apache MINA SSHD: LDAP injection in sshd-ldap
CVE-2026-102509 8.7 HIGH Apache PLC4X, Apache PLC4X: Pre-authentication resource exhaustion in the OPC UA driver an
CVE-2026-102510 8.7 HIGH Apache PLC4X: Go binding: unbounded allocation and framing failures on wire-controlled len
CVE-2026-102511 8.5 HIGH Apache PLC4X, Apache PLC4X, Apache PLC4X, Apache PLC4X: ADS discovery accepts spoofed resp
CVE-2026-93994 8.1 HIGH Apache MINA SSHD: Repeated-publickey policy bypass on server
CVE-2026-94002 7.5 HIGH Apache MINA SSHD: Memory exhaustion in SFTP client via unsolicited SFTP replies
CVE-2026-93995 6.5 MEDIUM Apache MINA SSHD: Remote execution of JGit "archive -o=file.zip" can write file on the ser
CVE-2026-94029 6.5 MEDIUM Apache MINA SSHD: Memory exhaustion in SFTP v6 check-file-name/check-file-handle extension
CVE-2026-93996 6.5 MEDIUM Apache MINA SSHD: Memory exhaustion DoS via unbounded SCP command line read
CVE-2026-95616 Apache WSS4J: Unauthenticated denial of service via integer overflow in DER parsing of X.5
CVE-2026-85532 Apache WSS4J: Insufficient Validation of Derived-Key Parameters
CVE-2026-87830 Apache WSS4J: Streaming WS-SecurityPolicy validation may skip element-protection checks.
CVE-2026-88920 Apache WSS4J: SAML Sender-Vouches Authentication Bypass
CVE-2026-89238 Apache WSS4J: WSS4J EncryptedHeader child confusion causing wrong protected-header selecti
CVE-2026-92121 Apache WSS4J: WS-SecurityPolicy signature checks skipped in the streaming code after an ST

IV. Related Vulnerabilities

Same product: Apache WSS4J
Same vendor: Apache Software Foundation

V. Comments for CVE-2026-92899

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