How severe is CVE-2019-11318?

CVE-2019-11318 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-11318 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-11318?

CVE-2019-11318 affects Synacor Zimbra Collaboration Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-11318?

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

When was CVE-2019-11318 published?

CVE-2019-11318 was published on 2020-01-27 and last updated on 2026-06-17.

CVE-2019-11318

CVE-2019-11318 is a medium-severity vulnerability in Synacor Zimbra Collaboration Server with a CVSS 3.x base score of 5.4. 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 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Synacor Zimbra Collaboration Server
Published: 2020-01-27
Last modified: 2026-06-17

Description

Zimbra Collaboration before 8.8.12 Patch 1 has persistent XSS.

Frequently asked questions

What is CVE-2019-11318?: Zimbra Collaboration before 8.8.12 Patch 1 has persistent XSS.
How severe is CVE-2019-11318?: CVE-2019-11318 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-11318 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-11318?: CVE-2019-11318 affects Synacor Zimbra Collaboration Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-11318?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-11318 published?: CVE-2019-11318 was published on 2020-01-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:synacor:zimbra_collaboration_server:*:*:*:*:*:*:*:*

More vulnerabilities in Synacor Zimbra Collaboration Server

CVE-2014-8563 — Critical (CVSS 9.8): Synacor Zimbra Collaboration before 8.0.9 allows plaintext command injection during STARTTLS.
CVE-2014-5500 — Medium (CVSS 6.1): Synacor Zimbra Collaboration before 8.0.8 has XSS.
CVE-2015-2230 — Medium (CVSS 6.1): Synacor Zimbra Collaboration Server 8.x before 8.7.0 has Reflected XSS in admin console.
CVE-2015-2249 — Medium (CVSS 5.4): Zimbra Collaboration before 8.6.0 patch5 has XSS.

All CVEs affecting Synacor Zimbra Collaboration Server →

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