Vulnerability · Published Sep 30, 2026 · Assigned by apache
CVE-2026-92121Apache WSS4J: WS-SecurityPolicy signature checks skipped in the streaming code after an STR-Transform reference
High 7.5
In plain English
A high-severity security flaw in Apache WSS4J from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).
Official description
In the WSS4J streaming (StAX) code, a signature reference using the WS-Security STR-Transform leaves an internal "inside signed content" flag permanently set. The WS-SecurityPolicy enforcer uses that flag to decide whether an element needs checking, so it stops evaluating SignedParts and SignedElements for the rest of the message. A policy requiring the SOAP Body to be signed is then satisfied even when the Body carries no signature, removing the protection against XML Signature Wrapping. Signature verification itself is unaffected. The DOM code is not affected. Users are recommended to upgrade to versions 4.0.2 or 3.0.6 or 2.4.4 which fix this issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | wss4j | no fix listed | DEBIAN-CVE-2026-92121 |
| Debian:14 | wss4j | no fix listed | DEBIAN-CVE-2026-92121 |
| Ubuntu:22.04:LTS | wss4j | no fix listed | UBUNTU-CVE-2026-92121 |
| Ubuntu:26.10 | wss4j | no fix listed | UBUNTU-CVE-2026-92121 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache WSS4J | 4.0.0 – before 4.0.23.0.0 – before 3.0.60 – before 2.4.4 |
Weakness: CWE-693 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N