Critical

Improper Access Control in SLF4J

Disclosed: 13.05.2022
Updated: 11.10.2026 12:21

org.slf4j.ext.EventData in the slf4j-ext module in QOS.CH SLF4J before 1.8.0-beta4 allows remote attackers to bypass intended access restrictions via crafted data. EventData in the slf4j-ext module in QOS.CH SLF4J, has been fixed in SLF4J version 1.7.26 and later and in the 2.0.x series.

Note that while the fix commit is associated with the tag 1.8.0-beta3, the versions in Maven go directly from 1.8.0-beta2 to 1.8.0-beta4.

Affected software

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Platform	Package	Vulnerable versions	Fixed in
Java / Kotlin (Maven)	org.slf4j:slf4j-ext	< 1.7.26, >= 1.8.0-alpha0, < 1.8.0-beta4	1.7.26, 1.8.0-beta4

References

CVSS score 9.8/10

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-284
Platform: Java / Kotlin (Maven)
Package: org.slf4j:slf4j-ext
Disclosed: 13.05.2022
Updated: 11.10.2026 12:21

Sources and licenses

OSV / GitHub Advisory Database - GHSA-w77p-8cfg-2x43 - CC BY 4.0

Vulnerability history: org.slf4j:slf4j-ext

All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.

This is the only known vulnerability of this package.

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