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AvantraApplication

CVE-2026-8671

HIGH · 7.5 CVSS v3.1 Published 2026-05-22
Fix available
A fix is available. Upgrade to 25.3.0 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Insertion of sensitive information into log file vulnerability in syslink software AG Avantra on Linux, Windows allows Resource Leak Exposure. This issue affects Avantra: before 25.3.0.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Avantra software contains a vulnerability where sensitive information is written to log files, potentially exposing credentials, tokens, or other confidential data. This occurs on both Linux and Windows platforms before version 25.3.0. The resource leak exposure aspect suggests the sensitive data may persist in logs longer than intended or accumulate over time.

MitigationUpgrade Avantra to version 25.3.0 or later to remediate this vulnerability. Additionally, review existing log files for any exposed sensitive information and implement log sanitization processes to prevent future occurrences.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
AvantraApplication
Affected:< 25.3.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Determine installed Avantra version
    Locate the Avantra installation directory and check the version file, manifest, or use the Avantra command-line tool to query the current version (e.g., avantra --version or check version info in the management console).
    Affected if The installed version is lower than 25.3.0, meaning the log injection vulnerability is present.
  2. Identify Avantra log file locations
    Check the Avantra configuration for log directory paths; common locations include logs/ or var/log/ within the Avantra installation directory, or paths configured in log4j.xml, logback.xml, or similar logging configuration files.
    Affected if Log files exist in standard or configured directories, meaning log output is being written and could contain sensitive data.
  3. Search log files for sensitive patterns
    Use grep, Select-String, or similar tools to search log files for patterns indicating sensitive data: passwords=*, tokens=*, cred=*, api_key, Authorization headers, or database connection strings containing credentials.
    Affected if Log files contain any plaintext credentials, tokens, API keys, or patterns matching sensitive data fields.
  4. Check for credential exposure in recent logs
    Examine the most recent log files (e.g., those modified within the past 30 days) for any entries containing user credentials, authentication tokens, or PII that should not have been logged.
    Affected if Recent log entries contain any authentication credentials, tokens, or personally identifiable information in plaintext.
  5. Audit log file permissions
    Verify that log files have restrictive permissions (e.g., only the Avantra service account can read them) and are not world-readable or accessible to unauthorized users.
    Affected if Log files have overly permissive access controls, allowing unauthorized users to read sensitive log content.

A system is affected if Avantra version is below 25.3.0 AND log files contain any exposed credentials, tokens, or sensitive data that should not have been written to logs.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 25.3.0 or later
Fixed in 25.3.0
Interim mitigation

Upgrade Avantra to version 25.3.0 or later to remediate this vulnerability. Additionally, review existing log files for any exposed sensitive information and implement log sanitization processes to prevent future occurrences.

Recommended fix Moderate confidence

25.3.0

  1. 1. Back up your current Avantra installation and configuration
  2. 2. Download Avantra version 25.3.0 or later from the official vendor repository (support.avantra.com)
  3. 3. Stop the Avantra services
  4. 4. Install the upgraded version following standard upgrade procedures
  5. 5. Verify the installation completed successfully
  6. 6. Restart Avantra services
  7. 7. Confirm the vulnerability is resolved by checking that sensitive information is no longer written to log files

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Avantra Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-8671 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data