EUVD-2026-58667
GHSA-9mh8-hq67-v26g
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:N/R:X/V:X/RE:M/U:Green
AC:H reflects the prerequisite MDC-discriminator configuration; PR:N and AV:N because HTTP reachability requires no credentials; limited CIA impact from file write outside intended directory.
Primary rating from Vendor (NCSC.ch).
CVSS VectorVendor: NCSC.ch
Lifecycle Timeline
2DescriptionCVE.org
Path-traversal vulnerability in QOS.CH Sarl Logback-classic on Java (logback-classic module) allows path-traversal vulnerability. More specifically, an MDC-based discriminator value flows unsanitized into a nested FileAppender path, letting an attacker who influences that MDC value (e.g. via an HTTP header) create and append log files outside the intended directory.
This issue affects Logback-classic: from 0.9.14 through 1.6.2.
AnalysisAI
Path traversal in Logback-classic versions 0.9.14 through 1.6.2 enables a remote unauthenticated attacker to create and append log files at arbitrary filesystem locations by injecting traversal sequences into an MDC (Mapped Diagnostic Context) value that flows unsanitized into a nested FileAppender path. Deployments using MDC-based discriminators - a pattern frequently triggered by HTTP header values automatically stored in MDC by web frameworks - are directly at risk. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target application uses Logback-classic's SiftingAppender (or an equivalent MDC-based dynamic FileAppender configuration in logback.xml) where the discriminator key resolves to a value the attacker can influence - most commonly an HTTP request header automatically copied into MDC by a framework interceptor, servlet filter, or MDC propagation adapter. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 6.3 (AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L) is an appropriate representation: the network vector and absence of privilege requirements reflect the HTTP-reachable attack surface, while AT:P correctly captures the prerequisite that a specific, non-default configuration - an MDC-based discriminator driving a FileAppender path - must be present. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade logback-classic to version 1.6.3 or later, per QOS.CH Sarl release notes at https://logback.qos.ch/news.html#1.6.3; this is the primary and recommended fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
Oracle Java SE 7 Update 6 and earlier contains multiple sandbox bypass vulnerabilities via the ClassFinder and forName m
Remote code execution in IBM Sterling B2B Integrator, Sterling Integrator, and Tivoli Common Reporting allows unauthenti
Java Runtime Environment sandbox bypass via incorrect image channel verification in 2D component allows remote unauthent
Oracle Java SE JDK/JRE 7 and 6 Update 27 and earlier allows remote code execution with complete system compromise throug
JBoss Seam 2 in Red Hat JBoss EAP 4.3.0 fails to sanitize JBoss Expression Language inputs, allowing remote attackers to
Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 update 4 and earlier, 6 up
Multiple vulnerabilities in Oracle Java 7 before Update 11 allow remote attackers to execute arbitrary code by (1) using
Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 2 and earlier, 6 Up
The WLS Security component in Oracle WebLogic Server 10.3.6.0, 12.1.2.0, 12.1.3.0, and 12.2.1.0 allows remote attackers
Unspecified vulnerability in the Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 7 and earlier allow
Remote unauthenticated attackers can execute arbitrary code on Adobe ColdFusion servers through Java deserialization fla
The ExceptionDelegator component in Apache Struts before 2.2.3.1 interprets parameter values as OGNL expressions during
Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
View allShare
External POC / Exploit Code
Leaving vuln.today