How severe is CVE-2019-1003026?

CVE-2019-1003026 has a CVSS score of 4.3/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2019-1003026?

CVE-2019-1003026 affects the following packages: org.jenkins-ci.plugins:mattermost (Maven). Ecosystems affected: Maven.

How do I fix CVE-2019-1003026?

Update org.jenkins-ci.plugins:mattermost to 2.6.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-1003026 is resolved across your whole dependency graph.

How do I detect CVE-2019-1003026 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.plugins:mattermost, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2019-1003026 if there is no patch (or I can't update yet)?

Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.

Is CVE-2019-1003026 actively exploited in the wild?

No public exploit code has been indexed for CVE-2019-1003026 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2019-1003026?

CVE-2019-1003026 has an EPSS (Exploit Prediction Scoring System) score of 0.9%, placing it in the 60th 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. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2019-1003026?

CVE-2019-1003026 is classified as Server-Side Request Forgery (SSRF) (CWE-918). 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.

When was CVE-2019-1003026 published, and has it been updated?

CVE-2019-1003026 was published on February 20, 2019 and was last updated on October 24, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2019-1003026 — mattermost

MEDIUM

CVE-2019-1003026 is a medium-severity (CVSS 4.3) Server-Side Request Forgery (SSRF) vulnerability in org.jenkins-ci.plugins:mattermost. A fix is available for org.jenkins-ci.plugins:mattermost — see the affected versions and patch details below.

Jenkins Mattermost Notification Plugin vulnerable to SSRF

Also known asGHSA-wxj2-qc9p-65r3

Published

Feb 20, 2019

Updated

Oct 24, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.9%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs60th percentile — riskier than 60% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

☕org.jenkins-ci.plugins:mattermost

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

A server-side request forgery vulnerability exists in Jenkins Mattermost Notification Plugin 2.6.2 and earlier in MattermostNotifier.java that allows attackers with Overall/Read permission to have Jenkins connect to an attacker-specified Mattermost server and room and send a message.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.jenkins-ci.plugins:mattermost`	all versions	2.6.3`org.jenkins-ci.plugins:mattermost:2.6.3`

Affected Products

1 product · 1 configurations

Application

mattermostjenkins

≤ 2.6.2

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jenkins-ci.plugins:mattermost, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.jenkins-ci.plugins:mattermost to 2.6.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-1003026 is resolved across your whole dependency graph.
Workarounds
Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2019-1003026 in your dependencies?

Find it across Maven, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

4.3/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Raw vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CWE Classification

CWE-918Server-Side Request Forgery (SSRF)

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Feb 20, 2019

Last updated

Oct 24, 2026

Identifiers

CVE-2019-1003026

GHSA-wxj2-qc9p-65r3

References

Advisorysecurityfocus.com Advisoryjenkins.io · 2019 02 19 Advisorynvd.nist.gov · CVE 2019 1003026

Related vulnerabilities

Also affects mattermost

This CVE is medium severity, in line with the other 1 CVE affecting mattermost.

CVE-2019-10459

Same weakness: CWE-918

This CVE is medium severity; 7 of 7 other CVEs with CWE-918 are rated as high or higher (top: high).

CVE-2026-28385GHSA-7wpf-ch8f-5f4xCVE-2026-54442GHSA-4mfg-r38w-w8fgCVE-2026-118660CVE-2026-108360CVE-2026-114609Browse all CWE-918

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026

CVE-2019-1003026 — mattermost

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2019-1003026 in your dependencies?