CVE-2018-6354: templates/forms/thanks.html in Formspree before 2018-01-23 allows XSS related to the _next parameter.

Q: How do I fix CVE-2018-6354?

formspree: upgrade to 2018-01-23. Exact commands for each OS are on this page.

Q: Is CVE-2018-6354 being exploited?

CVE-2018-6354 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-6354 affect?

CVE-2018-6354 affects formspree. Severity is medium (CVSS 6.1). templates/forms/thanks.html in Formspree before 2018-01-23 allows XSS related to the _next parameter.

Q: How urgent is CVE-2018-6354?

Priority 40/100. Public exploit reference

This month

MEDIUM 6.1UPGRADE

CVE-2018-6354 is a medium-severity flaw (CVSS 6.1) affecting formspree. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

templates/forms/thanks.html in Formspree before 2018-01-23 allows XSS related to the _next parameter.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 45%)
CISA exploited list	No
Weakness	CWE-79
Published	2018-01-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: formspree

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-01-27 15:29 UTCPublished CVE record published
2026-06-17 02:01 UTCUpdated Record last modified

formspree formspree UPGRADE

Affected: < 2018-01-23

Fixed in: 2018-01-23

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy formspree || rpm -q formspree || formspree --version

2. UPGRADE to 2018-01-23 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade formspree

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade formspree

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-6354?

formspree: upgrade to 2018-01-23. Exact commands for each OS are on this page.

Is CVE-2018-6354 being exploited?

CVE-2018-6354 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-6354 affect?

CVE-2018-6354 affects formspree. Severity is medium (CVSS 6.1). templates/forms/thanks.html in Formspree before 2018-01-23 allows XSS related to the _next parameter.

How urgent is CVE-2018-6354?

Priority 40/100. Public exploit reference

References

← Back to latest CVEs