How severe is CVE-2019-18378?

CVE-2019-18378 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-18378 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-2019-18378?

CVE-2019-18378 affects Symantec Messaging Gateway. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-18378?

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

When was CVE-2019-18378 published?

CVE-2019-18378 was published on 2019-12-11 and last updated on 2026-06-17.

CVE-2019-18378

CVE-2019-18378 is a medium-severity vulnerability in Symantec Messaging Gateway with a CVSS 3.x base score of 4.8. 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 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Symantec Messaging Gateway
Published: 2019-12-11
Last modified: 2026-06-17

Description

Symantec Messaging Gateway, prior to 10.7.3, may be susceptible to a cross-site scripting (XSS) exploit, which is a type of issue that can enable attackers to inject client-side scripts into web pages viewed by other users. A cross-site scripting vulnerability may be used by attackers to potentially bypass access controls such as the same-origin policy.

Frequently asked questions

What is CVE-2019-18378?: Symantec Messaging Gateway, prior to 10.7.3, may be susceptible to a cross-site scripting (XSS) exploit, which is a type of issue that can enable attackers to inject client-side scripts into web pages viewed by other users. A cross-site scripting vulnerability may be used by attackers to potentially bypass access controls such as the same-origin policy.
How severe is CVE-2019-18378?: CVE-2019-18378 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-18378 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-2019-18378?: CVE-2019-18378 affects Symantec Messaging Gateway. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-18378?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-18378 published?: CVE-2019-18378 was published on 2019-12-11 and last updated on 2026-06-17.

References

https://support.symantec.com/us/en/article.SYMSA1501.html

Affected products (1)

cpe:2.3:a:symantec:messaging_gateway:*:*:*:*:*:*:*:*

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