CVE-2026-9507: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-6cj6-2fg2-2r4g
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CWE-38
Published
Advisory Summary

CVE-2026-9507 is a MODERATE security vulnerability vulnerability (CWE-38: Path Traversal: '\absolute\pathname\here') affecting Software libraries in the Maven ecosystem. The weakness occurs when the product accepts input in the form of a backslash absolute path ('\absolute\pathname\here') without appropriate validation, which can allow an attacker to traverse the file system to unintended locations or access arbitrary files.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-9507 at a Glance

CVE Identifier CVE-2026-9507
GHSA Identifier GHSA-6cj6-2fg2-2r4g
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-38: Path Traversal: '\absolute\pathname\here'
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-9507

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-9507, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-38: Path Traversal: '\absolute\pathname\here', where the product accepts input in the form of a backslash absolute path ('\absolute\pathname\here') without appropriate validation, which can allow an attacker to traverse the file system to unintended locations or access arbitrary files. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A session fixation vulnerability has been identified in osTicket v1.18.2. This security flaw allows an attacker to hijack a victim’s account by keeping the initial session identifier (OSTSESSID) active after a successful login. The issue lies in the fact that the application does not invalidate the pre-authentication cookie or generate a new identifier for the authenticated context. As a result, if an attacker manages to set a known session identifier in the victim’s browser, they will be able to maintain unauthorised access to the account once the victim has authenticated.

References

NVD — CVE-2026-9507 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9507
www.incibe.es/en/incibe-cert/noti... WEB
https://www.incibe.es/en/incibe-cert/notices/aviso/session-fixation-vulnerability-enhancesofts-osticket

Frequently Asked Questions

What is CVE-2026-9507?
CVE-2026-9507 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-38: Path Traversal: '\absolute\pathname\here'.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-9507?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-9507?
CVE-2026-9507 is classified under CWE-38: Path Traversal: '\absolute\pathname\here' (The product accepts input in the form of a backslash absolute path ('\absolute\pathname\here') without appropriate validation, which can allow an attacker to traverse the file system to unintended locations or access arbitrary files.).
How can I check Maven dependencies for CVE-2026-9507?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6cj6-2fg2-2r4g",
  "modified" : "2026-06-16T15:33:50Z",
  "published" : "2026-06-16T15:33:50Z",
  "aliases" : [ "CVE-2026-9507" ],
  "details" : "A session fixation vulnerability has been identified in osTicket v1.18.2. This security flaw allows an attacker to hijack a victim’s account by keeping the initial session identifier (OSTSESSID) active after a successful login.\n\n\n\nThe issue lies in the fact that the application does not invalidate the pre-authentication cookie or generate a new identifier for the authenticated context. As a result, if an attacker manages to set a known session identifier in the victim’s browser, they will be able to maintain unauthorised access to the account once the victim has authenticated.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/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:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-9507"
  }, {
    "type" : "WEB",
    "url" : "https://www.incibe.es/en/incibe-cert/notices/aviso/session-fixation-vulnerability-enhancesofts-osticket"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-38" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-16T13:16:38Z"
  }
}