CVE-2026-889209.8Critical
CVE-2026-88920: Apache WSS4J: SAML Sender-Vouches Authentication Bypass
Apache Software Foundation · Apache WSS4J
Vendor fix available · Affected: Apache Software Foundation Apache WSS4J · Exploitation: not established
ExploitationNot established
Not in CISA KEV as of catalogue 2026.11.13 (13 Nov)
- In CISA KEV: not seen
- Exploited (reported): not seen
- Scanning observed: not seen
- Proof of concept public: not seen
- Not establishedNothing in the sources we check
0.6%probability of exploitation in the next 30 days
48th percentile
050100
Higher than 48% of scored CVEs
9.8CriticalCVSS
LowMediumHighCrit.
DescriptionNVD
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.
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Published
- September 2026
Coverage1 article · 1 outlet
First in our coverage: SecurityOnline, 1 Oct.
- Apache WSS4J Flaws Let Attackers Forge Authenticated MessagesSecurityOnline · first in our coverage
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