How severe is CVE-2018-6354?

CVE-2018-6354 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-6354 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-6354?

CVE-2018-6354 affects Formspree. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-6354?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-6354 published?

CVE-2018-6354 was published on 2018-01-27 and last updated on 2026-06-17.

CVE-2018-6354

CVE-2018-6354 is a medium-severity vulnerability in Formspree with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Formspree
Published: 2018-01-27
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2018-6354?: templates/forms/thanks.html in Formspree before 2018-01-23 allows XSS related to the _next parameter.
How severe is CVE-2018-6354?: CVE-2018-6354 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-6354 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-6354?: CVE-2018-6354 affects Formspree. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-6354?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-6354 published?: CVE-2018-6354 was published on 2018-01-27 and last updated on 2026-06-17.

References

https://github.com/formspree/formspree/commit/5f18eeaaa459bee9a58f70cdf7c46adb1ef34ea7

Affected products (1)

cpe:2.3:a:formspree:formspree:*:*:*:*:*:*:*:*

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →