CVE-2026-39791 WordPress Mailjet Email Marketing plugin <= 6.2.3 - Sensitive Data Exposure vulnerability
Medium 5.3
Published
Updated
Check this codebase for CVE-2026-39791 and fix it if it is affected.
What it is: CVE-2026-39791 is a medium-severity vulnerability in Mailjet Email Marketing, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-39791 in the wild and no public exploit code.
Affected product: Mailjet Email Marketing. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-39791/ (Markdown: https://insights.sbomify.com/CVE-2026-39791/index.md)
Unauthenticated attackers can access sensitive data in the Mailjet Email Marketing WordPress plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39791?
CVE-2026-39791 is a medium-severity vulnerability in Mailjet Email Marketing, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Unauthenticated Sensitive Data Exposure in Mailjet Email Marketing <= 6.2.3 versions.
Weakness: CWE-201
Which versions are affected by CVE-2026-39791?
How do I fix CVE-2026-39791?
No fix has been published for CVE-2026-39791 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-39791 being exploited?
There is no known exploitation of CVE-2026-39791 in the wild and no public exploit code.
Sources
Also known as GHSA-g35c-mm2g-fxmw.