How severe is CVE-2018-5478?

CVE-2018-5478 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-2018-5478 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-5478?

CVE-2018-5478 affects Contao. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-5478?

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

When was CVE-2018-5478 published?

CVE-2018-5478 was published on 2023-09-21 and last updated on 2026-06-17.

CVE-2018-5478

CVE-2018-5478 is a medium-severity vulnerability in Contao 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)
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Contao
Published: 2023-09-21
Last modified: 2026-06-17

Description

Contao 3.x before 3.5.32 allows XSS via the unsubscribe module in the frontend newsletter extension.

Frequently asked questions

What is CVE-2018-5478?: Contao 3.x before 3.5.32 allows XSS via the unsubscribe module in the frontend newsletter extension.
How severe is CVE-2018-5478?: CVE-2018-5478 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-2018-5478 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-5478?: CVE-2018-5478 affects Contao. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-5478?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-5478 published?: CVE-2018-5478 was published on 2023-09-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:contao:contao:*:*:*:*:*:*:*:*

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