# Synacor vulnerabilities > Synacor has 67 published vulnerabilities across 2 products in our catalogue. 10 of them are on the list of flaws known to be exploited, so criminals are using them now. The most affected product is Zimbra Collaboration Suite, with 62. If you run Synacor software, patch the exploited flaws first. Canonical page: https://www.precursorintelligence.com/vendors/synacor ## At a glance - **Published vulnerabilities:** 67 - **Known to be exploited:** 10 - **Products:** 2 - **Versions:** 145 - **Most recently added to the known-exploited list:** [CVE-2025-66376](https://www.precursorintelligence.com/what-is/cve-2025-66376), 18 March 2026. We keep watching the list. ## Which Synacor products have the most vulnerabilities? - [Zimbra Collaboration Suite](https://www.precursorintelligence.com/product/synacor/zimbra_collaboration_suite): 62 published vulnerabilities, 93 versions - [Zimbra Collaboration Server](https://www.precursorintelligence.com/product/synacor/zimbra_collaboration_server): 5 published vulnerabilities, 52 versions Each product page lists its own known-exploited flaws. ## Which Synacor vulnerabilities are being exploited? 10 flaws are on the government list of vulnerabilities known to be exploited, newest first: - [CVE-2025-66376](https://www.precursorintelligence.com/what-is/cve-2025-66376): Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability. High, CVSS 7.2, chance of use in 30 days 20%, known exploited since 18 March 2026. - [CVE-2020-7796](https://www.precursorintelligence.com/what-is/cve-2020-7796): Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 84%, known exploited since 17 February 2026. - [CVE-2019-9621](https://www.precursorintelligence.com/what-is/cve-2019-9621): Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability. High, CVSS 7.5, chance of use in 30 days 81%, known exploited since 7 July 2025. - [CVE-2023-34192](https://www.precursorintelligence.com/what-is/cve-2023-34192): Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability. Critical, CVSS 9.0, chance of use in 30 days 77%, known exploited since 25 February 2025. - [CVE-2023-37580](https://www.precursorintelligence.com/what-is/cve-2023-37580): Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability. Medium, CVSS 6.1, chance of use in 30 days 49%, known exploited since 27 July 2023. - [CVE-2022-27926](https://www.precursorintelligence.com/what-is/cve-2022-27926): Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability. Medium, CVSS 6.1, chance of use in 30 days 18%, known exploited since 3 April 2023. - [CVE-2022-27925](https://www.precursorintelligence.com/what-is/cve-2022-27925): Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability. High, CVSS 7.2, chance of use in 30 days 99%, known exploited since 11 August 2022. - [CVE-2022-27924](https://www.precursorintelligence.com/what-is/cve-2022-27924): Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerability. High, CVSS 7.5, chance of use in 30 days 94%, known exploited since 4 August 2022. - [CVE-2018-6882](https://www.precursorintelligence.com/what-is/cve-2018-6882): Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability. Medium, CVSS 6.1, chance of use in 30 days 30%, known exploited since 19 April 2022. - [CVE-2019-9670](https://www.precursorintelligence.com/what-is/cve-2019-9670): Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference. Critical, CVSS 9.8, chance of use in 30 days >99%, known exploited since 10 January 2022. ## Which Synacor flaws are most likely to be used? Ranked by the latest exploit-likelihood forecast (the chance each flaw is used in an attack in the next 30 days): - [CVE-2019-9670](https://www.precursorintelligence.com/what-is/cve-2019-9670): >99%, Critical (CVSS 9.8), known exploited - [CVE-2022-27925](https://www.precursorintelligence.com/what-is/cve-2022-27925): 99%, High (CVSS 7.2), known exploited - [CVE-2022-27924](https://www.precursorintelligence.com/what-is/cve-2022-27924): 94%, High (CVSS 7.5), known exploited - [CVE-2013-7091](https://www.precursorintelligence.com/what-is/cve-2013-7091): 86%, Medium (CVSS 5.0) - [CVE-2020-7796](https://www.precursorintelligence.com/what-is/cve-2020-7796): 84%, Critical (CVSS 9.8), known exploited - [CVE-2019-9621](https://www.precursorintelligence.com/what-is/cve-2019-9621): 81%, High (CVSS 7.5), known exploited - [CVE-2023-34192](https://www.precursorintelligence.com/what-is/cve-2023-34192): 77%, Critical (CVSS 9.0), known exploited - [CVE-2023-37580](https://www.precursorintelligence.com/what-is/cve-2023-37580): 49%, Medium (CVSS 6.1), known exploited - [CVE-2025-25064](https://www.precursorintelligence.com/what-is/cve-2025-25064): 37%, High (CVSS 8.8) - [CVE-2018-6882](https://www.precursorintelligence.com/what-is/cve-2018-6882): 30%, Medium (CVSS 6.1), known exploited ## All Synacor products we track 2 products with at least one tracked version, most vulnerabilities first: - [Zimbra Collaboration Suite](https://www.precursorintelligence.com/product/synacor/zimbra_collaboration_suite): 62 vulnerabilities, 93 versions - [Zimbra Collaboration Server](https://www.precursorintelligence.com/product/synacor/zimbra_collaboration_server): 5 vulnerabilities, 52 versions ## Questions ### How many vulnerabilities does Synacor have? Our catalogue lists 67 published vulnerabilities across 2 products and 145 versions from Synacor. The most recent Synacor flaw added to the known-exploited list is CVE-2025-66376, on 18 March 2026. ### Which Synacor vulnerabilities are being exploited? 10 Synacor vulnerabilities are on the list of flaws known to be exploited. The most recently added are CVE-2025-66376, CVE-2020-7796 and CVE-2019-9621. The full list is on this page. ### Which Synacor product has the most vulnerabilities? Zimbra Collaboration Suite, with 62 published vulnerabilities. Its own page lists the ones known to be exploited. ### How do I get alerts for new Synacor vulnerabilities? Create a Precursor Intelligence account and track the Synacor products you run. We match them against every published flaw, give each one a risk score from 0 to 100 and tell you as soon as we spot one that affects you, by email, in the app or by webhook. ## Running Synacor? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact