7.5

CVE-2026-92121: apache software foundation apache wss4j Protection Mechanism Failure

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-92121DEBIAN-CVE-2026-92121
Published 30-09-2026Last modified 30-09-2026
Open JSON

Vulnerability summary

CVE-2026-92121 is a high (CVSS 7.5) Protection Mechanism Failure vulnerability in apache software foundation apache wss4j. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 44.6% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.55%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 30-09-2026
    PublishedVulnerability first disclosed.
  2. 30-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.55%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

01-10-202618-10-2026
EPSS score
0.55%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Apache1 product
  • wss4j< 2.4.4 | ≥ 3.0.0, < 3.0.6 | ≥ 4.0.0, < 4.0.2
Apache software foundation1 product
  • apache wss4j≥ 4.0.0, < 4.0.2 | ≥ 3.0.0, < 3.0.6 | < 2.4.4
Debian1 product
  • wss4jAll versions (No fix recorded)
Ubuntu1 product
  • wss4jAll versions (No fix recorded)

4 vendors · 4 products

References

5 links