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.
CVE-2026-92899
Score 4.8 from GitHub Security Advisory published 2026-09-30. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 4.8; sources differ by 0.0.
- Lower severity and no public exploit yet
No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.
- CVSS v3
- 4.8
- EG Score
- 4.8MEDIUMhigh confidence
- EG Risk
- 26EG Risk 26/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity48% × 45%Exploitation1% × 40%Automatability30% × 15%CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix. - EPSS PROB
- 0.5%
- EPSS %ILE
- 41st
- KEV
- Not listed
CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).
No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
September 30, 2026
Last Modified
October 2, 2026
Advisory Details (2)
Auto-updated Sep 30, 2026oss-security - CVE-2026-92899: Apache WSS4J: UsernameToken replay protection bypassed by re-encoding the Nonce
http://www.openwall.com/lists/oss-security/2026/09/30/13Vendor Advisories for CVE-2026-92899(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 14× in last 7d / 14× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-03 19:02 UTCEG score recompute
- 2026-10-03 19:01 UTCGHSA enrichment
- 2026-10-02 20:22 UTCEG score recompute
- 2026-10-02 20:22 UTCGHSA enrichment
- 2026-10-02 13:40 UTCEG score recompute
- 2026-10-02 13:39 UTCGHSA enrichment
- 2026-10-01 19:51 UTCEPSS rescore
- 2026-10-01 14:59 UTCGHSA enrichment
- 2026-09-30 16:23 UTCEG score recompute
- 2026-09-30 16:23 UTCGHSA enrichment
- 2026-09-30 13:18 UTCEG score recompute▲ 4.80
- 2026-09-30 13:18 UTCNVD updateCVSS v3 → 4.8 · severity → MEDIUM
- 2026-09-30 12:28 UTCEG score recompute
- 2026-09-30 12:27 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
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Dependency Blast Radius
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