CVE-2026-121730 emailflare before commit cf31f33 Missing Authorization via Inbox Compose Endpoint
High 7.1
Published
Updated
Check this codebase for CVE-2026-121730 and fix it if it is affected.
What it is: CVE-2026-121730 is a high-severity vulnerability in 0xdps emailflare, published on 3 Nov 2026.
Exploitation: There is no known exploitation of CVE-2026-121730 in the wild and no public exploit code.
Affected product: 0xdps emailflare. 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-2026-121730/ (Markdown: https://insights.sbomify.com/CVE-2026-121730/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-121730?
CVE-2026-121730 is a high-severity vulnerability in 0xdps emailflare, published on 3 Nov 2026.
Official description
emailflare before commit cf31f33 contains a missing authorization vulnerability in POST /api/inbox/compose that allows authenticated members to send mail as any sender address. Attackers can supply an arbitrary from field, which is passed unchecked to the Cloudflare send call, to impersonate other users or the organization to external recipients.
Weakness: CWE-862
Which versions are affected by CVE-2026-121730?
How do I fix CVE-2026-121730?
No fix has been published for CVE-2026-121730 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-121730 being exploited?
There is no known exploitation of CVE-2026-121730 in the wild and no public exploit code.
Sources
Also known as GHSA-7mvm-jcxm-mh2j.