How severe is CVE-2019-3396?

CVE-2019-3396 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which products are affected by CVE-2019-3396?

Affected package information for CVE-2019-3396 is not yet fully mapped. Check the official advisory links for details.

How do I patch CVE-2019-3396?

Apply the atlassian confluence server security patch or hotfix for CVE-2019-3396 on the affected version, following the vendor advisory for your exact build.

How do I detect CVE-2019-3396 across my infrastructure?

Inventory every atlassian confluence server deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for remote code execution at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

How do I mitigate CVE-2019-3396 if there is no patch (or I can't update yet)?

Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

How does O3 Security protect against CVE-2019-3396?

O3 detects and blocks CVE-2019-3396 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Is CVE-2019-3396 actively exploited in the wild?

Yes. There are 23 known exploit references for CVE-2019-3396, including 2 documented proof-of-concept exploits on Exploit-DB and 15 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2019-3396?

CVE-2019-3396 has an EPSS (Exploit Prediction Scoring System) score of 99.9%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2019-3396 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2019-3396 (Atlassian Confluence Server and Data Center Server-Side Template Injection Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-05-03. The required action was: Apply updates per vendor instructions. This CVE has been used in known ransomware campaigns. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2019-3396?

CVE-2019-3396 is classified as Path Traversal (CWE-22). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2019-3396?

CVE-2019-3396 affects atlassian confluence server. Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2019-3396?

A Nuclei detection template exists for CVE-2019-3396, meaning automated scanners can fingerprint it. 2 Metasploit modules reference CVE-2019-3396, which lowers the barrier to weaponization. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2019-3396 published, and has it been updated?

CVE-2019-3396 was published on March 25, 2019 and was last updated on June 17, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2021-11-03 — agencies required to remediate by 2022-05-03 · Ransomware

CVE-2019-3396

CRITICAL

The Widget Connector macro in Atlassian Confluence Server before version 6.6.12 (the fixed version for 6.6.x), from version 6.7.0 before 6.12.3 (the fixed version for 6.12.x), from…

Published

Mar 25, 2019

Updated

Jun 17, 2026

Affected

0 pkgs

Patched

None yet

Exploits

23 known

EPSS Exploitation Probability

via FIRST.org ↗

99.9%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

The Widget Connector macro in Atlassian Confluence Server before version 6.6.12 (the fixed version for 6.6.x), from version 6.7.0 before 6.12.3 (the fixed version for 6.12.x), from version 6.13.0 before 6.13.3 (the fixed version for 6.13.x), and from version 6.14.0 before 6.14.2 (the fixed version for 6.14.x), allows remote attackers to achieve path traversal and remote code execution on a Confluence Server or Data Center instance via server-side template injection.

Affected Products

1 product · 4 configurations

Application

confluence serveratlassian

≥ 6.14.0 && < 6.14.2

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-46731remotemultiple✓ Verified

Atlassian Confluence Widget Connector Macro - Velocity Template Injection (Metasploit)

by Metasploit · Apr 19, 2019

Exploit-DB Source

EDB-49465webappsmultiple

Atlassian Confluence Widget Connector Macro - SSTI

by 46o60 · Jan 22, 2021

Exploit-DB Source

Detection & mitigation playbook

Vendor / appliance

Detect
Inventory every atlassian confluence server deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for remote code execution at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.
Fix
Apply the atlassian confluence server security patch or hotfix for CVE-2019-3396 on the affected version, following the vendor advisory for your exact build.
Workarounds
Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.
How O3 protects you
O3 detects and blocks CVE-2019-3396 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2019-3396. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

O3 Security · Runtime Protection

Is CVE-2019-3396 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2019-3396 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.

Protect my workloads How runtime protection works

CVSS Score

9.8/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Network

AC:Attack Complexity

Low

PR:Privileges Required

None

UI:User Interaction

None

S:Scope

Unchanged

C:Confidentiality

High

I:Integrity

High

A:Availability

High

Raw vector

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

CWE Classification

Weaponization

Timeline

Disclosed

Mar 25, 2019

First exploit

Apr 19, 2019

KEV added

Nov 3, 2021

Last updated

Jun 17, 2026

Identifiers

CVE-2019-3396

References

Fixjira.atlassian.com Fixjira.atlassian.com Exploit / PoCpacketstormsecurity.com Exploit / PoCpacketstormsecurity.com Exploit / PoCrapid7.com Exploit / PoCexploit-db.com Exploit / PoCpacketstormsecurity.com Exploit / PoCpacketstormsecurity.com Exploit / PoCrapid7.com Exploit / PoCexploit-db.com Webcisa.gov

Data from OSV.dev, enriched by O3 Security. Refreshed hourly.

CVE-2019-3396

EPSS Exploitation Probability

Description

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

How O3 protects you

Frequently Asked Questions

Is CVE-2019-3396 being exploited in your environment?