Apache WSS4J · Authentication Bypass
Affects wss4jSource GCVE Database
Not known to be exploited · CVSS 9.8 Critical · fixed in 4.0.2 : patch wss4j as a priority.
Data as of 5 Nov 2026, 00:01 UTC
- EPSS
- 0.5% chance of exploitation in 30 days – higher than 47% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 4.0.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 30 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10wss4jpkg:deb/ubuntu/wss4j?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSwss4jpkg:deb/ubuntu/wss4j?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 22.04 LTSwss4jpkg:deb/ubuntu/wss4j?arch=source&distro=jammyOther threats | Affected
| Fixed in– |
Ubuntu 20.04 LTSwss4jpkg:deb/ubuntu/wss4j?arch=source&distro=focalOther threats | Affected
| Fixed in– |
Ubuntu 18.04 LTSwss4jpkg:deb/ubuntu/wss4j?arch=source&distro=bionicOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Users should upgrade Apache WSS4J to version 4.0.2, 3.0.6, or 2.4.4 or later, where this vulnerability is fixed. No other mitigations or workarounds are indicated in the available data.
Description
An authentication bypass vulnerability exists in the DOM security processor of Apache WSS4J. This flaw allows unauthenticated remote attackers to forge authenticated SOAP messages by using a crafted unsigned SAML sender-vouches assertion with an attacker-controlled key. The issue is fixed in versions 4.0.2, 3.0.6, and 2.4.4 of Apache WSS4J.