CVE-2026-88920
Apache WSS4J: SAML Sender-Vouches Authentication Bypass
An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key.
Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Apache WSS4J: SAML Sender-Vouches Authentication Bypass
An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key.
Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.
- Record
CVE-2026-88920- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-287
- Updated
- 2026-11-02
EUVDEUVD-2026-89793
An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key.
Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.
- Record
EUVD-2026-89793- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-4c9g-74h5-78r7 No score
An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated...
An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key.
Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.
- Record
GHSA-4c9g-74h5-78r7- Updated
- 2026-11-02
NVD
An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key.
Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.
- Record
CVE-2026-88920- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-287
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-88920
An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.
- Record
DEBIAN-CVE-2026-88920- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-88920
An authentication bypass in the DOM security processor in Apache WSS4J allows unauthenticated remote attackers to forge authenticated SOAP messages via a crafted unsigned SAML sender-vouches assertion containing an attacker-controlled key. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4, which fix this issue.
- Record
UBUNTU-CVE-2026-88920- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-04
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
wss4jDebian:12 |
All versions, plus listed versions 1.6.19-31.6.19-4 |
None known |
wss4jDebian:13 |
All versions, plus listed versions 1.6.19-4 |
None known |
wss4jDebian:14 |
All versions, plus listed versions 1.6.19-4 |
None known |
wss4jUbuntu:18.04:LTS |
All versions, plus listed versions 1.6.19-1 |
None known |
wss4jUbuntu:20.04:LTS |
All versions, plus listed versions 1.6.19-2 |
None known |
wss4jUbuntu:22.04:LTS |
All versions, plus listed versions 1.6.19-2 |
None known |
wss4jUbuntu:24.04:LTS |
All versions, plus listed versions 1.6.19-3 |
None known |
wss4jUbuntu:26.10 |
All versions, plus listed versions 1.6.19-4build1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-88920 is a critical vulnerability (CVSS 9.8) in Apache Wss4j, published September 30, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.58%, the 48th percentile. No source names a fixed version.
References
lists.apache.org/thread.html/grt43m3bgbzz0mk0cnho3rcybb1j01z9
openwall.com/lists/oss-security/2026/09/30/10
nvd.nist.gov/vuln/detail/CVE-2026-88920
github.com/advisories/GHSA-4c9g-74h5-78r7
security-tracker.debian.org/tracker/CVE-2026-88920
ubuntu.com/security/CVE-2026-88920
cve.org/CVERecord?id=CVE-2026-88920