# Zimbra Collaboration Suite vulnerabilities > Zimbra Collaboration Suite is made by Synacor. We track 62 published vulnerabilities in it, across 93 versions. 10 of them are on the list of flaws known to be exploited, the newest added on 18 March 2026. If you run Zimbra Collaboration Suite, check your version against the exploited flaws below and patch those first. Canonical page: https://www.precursorintelligence.com/product/synacor/zimbra_collaboration_suite ## At a glance - **Made by:** [Synacor](https://www.precursorintelligence.com/vendors/synacor) - **Published vulnerabilities:** 62 - **Known to be exploited:** 10 - **Versions tracked:** 93 - **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 versions of Zimbra Collaboration Suite do the exploited flaws hit? Each exploited flaw lists the versions it affects, as published. "10.0.0 to before 10.0.18" means from 10.0.0 up to, but not including, 10.0.18. - [CVE-2025-66376](https://www.precursorintelligence.com/what-is/cve-2025-66376) (Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability): 10.0.0 to before 10.0.18, 10.1.0 to before 10.1.13 - [CVE-2020-7796](https://www.precursorintelligence.com/what-is/cve-2020-7796) (Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability): before 8.8.15, 8.8.15, 8.8.15-p1, 8.8.15-p2, 8.8.15-p3, 8.8.15-p4, 8.8.15-p5, 8.8.15-p6 - [CVE-2019-9621](https://www.precursorintelligence.com/what-is/cve-2019-9621) (Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery (SSRF) Vulnerability): before 8.6.0, 8.6.0, 8.6.0-patch1, 8.6.0-patch2, 8.6.0-patch3, 8.6.0-patch4, 8.6.0-patch5, 8.6.0-patch6, 8.6.0-patch7, 8.6.0-patch8, 8.6.0-patch9, 8.6.0-patch10, 8.6.0-patch11, 8.6.0-patch12, 8.7.0 to before 8.7.11, 8.7.11, 8.7.11-patch1, 8.7.11-patch2, 8.7.11-patch3, 8.7.11-patch4, 8.7.11-patch5, 8.7.11-patch6, 8.7.11-patch7, 8.7.11-patch8, 8.7.11-patch9, 8.7.11-patch10, 8.8.0 to before 8.8.9, 8.8.9, 8.8.9-p5, 8.8.9-patch1, 8.8.9-patch2, 8.8.9-patch3, 8.8.9-patch4, 8.8.9-patch6, 8.8.9-patch7, 8.8.9-patch8, 8.8.9-patch9, 8.8.10, 8.8.10-patch1, 8.8.10-patch2, 8.8.10-patch3, 8.8.10-patch4, 8.8.10-patch6, 8.8.10-patch7, 8.8.11, 8.8.11-patch1, 8.8.11-patch2, 8.8.11-patch3 - [CVE-2023-34192](https://www.precursorintelligence.com/what-is/cve-2023-34192) (Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability): 8.8.15, 8.8.15-p1, 8.8.15-p2, 8.8.15-p3, 8.8.15-p4, 8.8.15-p5, 8.8.15-p6, 8.8.15-p7, 8.8.15-p8, 8.8.15-p9, 8.8.15-p10, 8.8.15-p11, 8.8.15-p12, 8.8.15-p13, 8.8.15-p14, 8.8.15-p15, 8.8.15-p16, 8.8.15-p17, 8.8.15-p18, 8.8.15-p19, 8.8.15-p20, 8.8.15-p21, 8.8.15-p22, 8.8.15-p23, 8.8.15-p24, 8.8.15-p25, 8.8.15-p26, 8.8.15-p27, 8.8.15-p28, 8.8.15-p29, 8.8.15-p30, 8.8.15-p31, 8.8.15-p31.1, 8.8.15-p32, 8.8.15-p33, 8.8.15-p34, 8.8.15-p35, 8.8.15-p36, 8.8.15-p37, 8.8.15-p38, 8.8.15-p39 - [CVE-2023-37580](https://www.precursorintelligence.com/what-is/cve-2023-37580) (Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability): 8.8.0 to before 8.8.15, 8.8.15-p3, 8.8.15-p5, 8.8.15-p11, 8.8.15-p26, 8.8.15-p30, 8.8.15-p31, 8.8.15-p32, 8.8.15-p33, 8.8.15-p34, 8.8.15-p35, 8.8.15-p37, 8.8.15-p38, 8.8.15-p40 - [CVE-2022-27926](https://www.precursorintelligence.com/what-is/cve-2022-27926) (Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability): 9.0.0, 9.0.0-p1, 9.0.0-p2, 9.0.0-p3, 9.0.0-p4, 9.0.0-p5, 9.0.0-p6, 9.0.0-p7, 9.0.0-p8, 9.0.0-p9, 9.0.0-p10, 9.0.0-p11, 9.0.0-p12, 9.0.0-p13, 9.0.0-p14, 9.0.0-p15, 9.0.0-p16, 9.0.0-p17, 9.0.0-p18, 9.0.0-p19, 9.0.0-p20, 9.0.0-p21, 9.0.0-p22, 9.0.0-p23 - [CVE-2022-27925](https://www.precursorintelligence.com/what-is/cve-2022-27925) (Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability): 8.8.15, 8.8.15-p1, 8.8.15-p2, 8.8.15-p3, 8.8.15-p4, 8.8.15-p5, 8.8.15-p6, 8.8.15-p7, 8.8.15-p8, 8.8.15-p9, 8.8.15-p10, 8.8.15-p11, 8.8.15-p12, 8.8.15-p13, 8.8.15-p14, 8.8.15-p15, 8.8.15-p16, 8.8.15-p17, 8.8.15-p18, 8.8.15-p19, 8.8.15-p20, 8.8.15-p21, 8.8.15-p22, 8.8.15-p23, 8.8.15-p24, 8.8.15-p25, 8.8.15-p26, 8.8.15-p27, 8.8.15-p28, 8.8.15-p29, 8.8.15-p30, 9.0.0, 9.0.0-p1, 9.0.0-p2, 9.0.0-p3, 9.0.0-p4, 9.0.0-p5, 9.0.0-p6, 9.0.0-p7, 9.0.0-p8, 9.0.0-p9, 9.0.0-p10, 9.0.0-p11, 9.0.0-p12, 9.0.0-p13, 9.0.0-p14, 9.0.0-p15, 9.0.0-p16, 9.0.0-p17, 9.0.0-p18, 9.0.0-p19, 9.0.0-p20, 9.0.0-p21, 9.0.0-p22, 9.0.0-p23 - [CVE-2022-27924](https://www.precursorintelligence.com/what-is/cve-2022-27924) (Synacor Zimbra Collaboration Suite (ZCS) Command Injection Vulnerability): 8.8.15, 8.8.15-p1, 8.8.15-p2, 8.8.15-p3, 8.8.15-p4, 8.8.15-p5, 8.8.15-p6, 8.8.15-p7, 8.8.15-p8, 8.8.15-p9, 8.8.15-p10, 8.8.15-p11, 8.8.15-p12, 8.8.15-p13, 8.8.15-p14, 8.8.15-p15, 8.8.15-p16, 8.8.15-p17, 8.8.15-p18, 8.8.15-p19, 8.8.15-p20, 8.8.15-p21, 8.8.15-p22, 8.8.15-p23, 8.8.15-p24, 8.8.15-p25, 8.8.15-p26, 8.8.15-p27, 8.8.15-p28, 8.8.15-p29, 8.8.15-p30, 8.8.15-p31, 9.0.0, 9.0.0-p1, 9.0.0-p2, 9.0.0-p3, 9.0.0-p4, 9.0.0-p5, 9.0.0-p6, 9.0.0-p7, 9.0.0-p8, 9.0.0-p9, 9.0.0-p10, 9.0.0-p11, 9.0.0-p12, 9.0.0-p13, 9.0.0-p14, 9.0.0-p15, 9.0.0-p16, 9.0.0-p17, 9.0.0-p18, 9.0.0-p19, 9.0.0-p20, 9.0.0-p21, 9.0.0-p22, 9.0.0-p23 - [CVE-2018-6882](https://www.precursorintelligence.com/what-is/cve-2018-6882) (Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability): before 8.7.0, 8.7.0, 8.8.0, 8.8.1, 8.8.2, 8.8.3, 8.8.4, 8.8.5, 8.8.6 - [CVE-2019-9670](https://www.precursorintelligence.com/what-is/cve-2019-9670) (Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference): 8.7.0 to before 8.7.11, 8.7.11, 8.7.11-p1, 8.7.11-p2, 8.7.11-p3, 8.7.11-p4, 8.7.11-p5, 8.7.11-p6, 8.7.11-p7, 8.7.11-p8, 8.7.11-p9 ## Which Zimbra Collaboration Suite 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 Zimbra Collaboration Suite 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 ## Questions ### How many vulnerabilities does Zimbra Collaboration Suite have? We track 62 published vulnerabilities listed under the name Zimbra Collaboration Suite, across 93 versions. The most recent Zimbra Collaboration Suite flaw added to the known-exploited list is CVE-2025-66376, on 18 March 2026. ### Which Zimbra Collaboration Suite vulnerabilities are being exploited? 10 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. ### Which versions of Zimbra Collaboration Suite do the exploited flaws affect? Each flaw names its own versions, usually as ranges. The newest, CVE-2025-66376, affects 10.0.0 to before 10.0.18, 10.1.0 to before 10.1.13. The versions for every exploited flaw are listed on this page. ### How do I get alerts for Zimbra Collaboration Suite? Create a Precursor Intelligence account and track Zimbra Collaboration Suite. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook. ## Running Zimbra Collaboration Suite? 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