CVE-2026-14556 HappyForms < 1.26.15 - Unauthenticated HTML Injection in Admin Notification Email via client_referer
Medium 5.4
Published
Updated
Check this codebase for CVE-2026-14556 and fix it if it is affected.
What it is: CVE-2026-14556 is a medium-severity vulnerability in Unknown HappyForms, published on 21 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-14556 in the wild and no public exploit code.
Affected product: Unknown HappyForms. 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-2026-14556/ (Markdown: https://insights.sbomify.com/CVE-2026-14556/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-14556?
CVE-2026-14556 is a medium-severity vulnerability in Unknown HappyForms, published on 21 Oct 2026.
Official description
The HappyForms WordPress plugin before 1.26.15 does not sanitise or escape a user-controlled referral value before embedding it in the form notification email, allowing unauthenticated attackers to inject arbitrary HTML into the emails site administrators receive.
Weakness: CWE-116
Which versions are affected by CVE-2026-14556?
How do I fix CVE-2026-14556?
No fix has been published for CVE-2026-14556 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-14556 being exploited?
There is no known exploitation of CVE-2026-14556 in the wild and no public exploit code.
Sources
Also known as GHSA-qwq5-hm76-r6p9.