---
title: "Zimbra Collaboration Suite vulnerabilities and CVEs"
url: https://radicalnotion.ai/vendor/zimbra/zimbra-collaboration-suite
type: product
description: "Zimbra Collaboration Suite has 25 published CVEs, 1 in CISA KEV and 6 with public exploits."
updated: 2026-10-23
source: RadicalNotion.AI
license: CC BY-NC 4.0 (https://creativecommons.org/licenses/by-nc/4.0/)
---

# Zimbra Collaboration Suite vulnerabilities

Vendor: [Zimbra](https://radicalnotion.ai/vendor/zimbra)

- **Published CVEs:** 25
- **In CISA KEV:** 1
- **With a public exploit:** 6
- **With a patch:** 6
- **Average CVSS:** 6.3
- **First CVE:** 2018-05-30
- **Latest CVE:** 2026-10-23

## Severity breakdown

| Severity | CVEs |
| --- | --- |
| Critical | 0 |
| High | 9 |
| Medium | 15 |
| Low | 1 |
| Unscored | 0 |

## Most common weakness types

| CWE | Name | CVEs |
| --- | --- | --- |
| [CWE-79](https://radicalnotion.ai/cwe/cwe-79) | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | 4 |
| [CWE-290](https://radicalnotion.ai/cwe/cwe-290) | Authentication Bypass by Spoofing | 3 |
| [CWE-639](https://radicalnotion.ai/cwe/cwe-639) | Authorization Bypass Through User-Controlled Key | 2 |
| [CWE-352](https://radicalnotion.ai/cwe/cwe-352) | Cross-Site Request Forgery (CSRF) | 2 |
| [CWE-90](https://radicalnotion.ai/cwe/cwe-90) | Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection') | 2 |
| [CWE-732](https://radicalnotion.ai/cwe/cwe-732) | Incorrect Permission Assignment for Critical Resource | 2 |
| [CWE-862](https://radicalnotion.ai/cwe/cwe-862) | Missing Authorization | 1 |
| [CWE-863](https://radicalnotion.ai/cwe/cwe-863) | Incorrect Authorization | 1 |

## CVEs by year

| Year | CVEs published |
| --- | --- |
| 2018 | 2 |
| 2019 | 0 |
| 2020 | 0 |
| 2021 | 0 |
| 2022 | 1 |
| 2023 | 0 |
| 2024 | 0 |
| 2025 | 0 |
| 2026 | 22 |

## Affected versions

| Version | Kind | CVEs |
| --- | --- | --- |
| \<= 10.1.21 | range | 9 |
| \<= 10.1.20 | range | 6 |
| \< 10.1.20 | range | 3 |
| \<= 10.1.17 | range | 2 |
| \< 10.1.17 | range | 1 |
| \< 10.1.21 | range | 1 |
| 8.6.0 | range | 1 |
| 8.8.8 | range | 1 |
| 10.1.20 | patched | 3 |
| 10.1.17 | patched | 1 |
| 10.1.21 | patched | 1 |

## CVEs

| CVE | Title | Severity | CVSS | CISA KEV | Public exploit | Patch |
| --- | --- | --- | --- | --- | --- | --- |
| CVE-2026-115786 | Zimbra Collaboration Suite Shared-File Mailbox Quota Accounting Error Enables Quota Exhaustion | medium | 6.5 | No | No | No |
| CVE-2026-115785 | Zimbra Collaboration Suite Data Source Test SMTP Command Injection via Unsanitized Email Address | medium | 4.3 | No | No | No |
| CVE-2026-93640 | Zimbra Collaboration Suite Local Privilege Escalation via Unrestricted zmunbound Sudo Configuration | high | 7.8 | No | No | No |
| CVE-2026-50057 | Zimbra Collaboration Suite Local Privilege Escalation via Unrestricted Postfix Sudo Permissions | high | 7.8 | No | No | No |
| CVE-2026-50056 | Zimbra Collaboration Suite Local Privilege Escalation via zmmailboxdmgr JVM Argument Injection | high | 7.8 | No | No | No |
| CVE-2026-93639 | Zimbra Collaboration Suite Missing Authorization in ConfigureZimlet Enables Delegated Administrator Privilege Escalation | high | 8.7 | No | No | No |
| CVE-2026-93638 | Zimbra Collaboration Suite Pre-Authentication Reflected Cross-Site Scripting via Login Page zrememberme Parameter | medium | 6.1 | No | Yes | No |
| CVE-2026-93636 | Zimbra Collaboration Suite LDAP Filter Injection via Calendar Resource Attribute Name | medium | 4.3 | No | Yes | No |
| CVE-2026-93634 | Zimbra Collaboration Suite Cross-Account Authorization Bypass via Forged Shared-File Records | medium | 4.3 | No | Yes | No |
| CVE-2026-93633 | Zimbra Collaboration Suite Briefcase CSS Sanitization Bypass via Non-ASCII Stylesheet Characters | medium | 5.4 | No | Yes | No |
| CVE-2026-93631 | Zimbra Collaboration Suite OAuth Extension Cross-Site Request Forgery Enables Account Linking | high | 7.1 | No | Yes | No |
| CVE-2026-93630 | Zimbra Collaboration Suite Email HTML Sanitizer Bypass via Hostname Canonicalization | medium | 4.3 | No | No | Yes |
| CVE-2026-93629 | Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar REQUEST Organizer Identity | medium | 5.3 | No | No | No |
| CVE-2026-93628 | Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar REPLY Attendee Response | medium | 5.3 | No | No | No |
| CVE-2026-93627 | Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar CANCEL/REQUEST Organizer | medium | 5.3 | No | No | No |
| CVE-2026-50053 | Zimbra Collaboration Suite RestFilter Request Attribute Override via Unauthenticated URL Parameters | high | 8.7 | No | No | No |
| CVE-2026-10632 | Zimbra Collaboration Suite Classic Web Client Reflected Cross-Site Scripting via Document Editor Packages Parameter | high | 8.7 | No | No | Yes |
| CVE-2026-93637 | Zimbra Collaboration Suite GraphQL Batched Authentication Bypasses Pre-Auth Rate Limiting | low | 3.7 | No | No | No |
| CVE-2026-93635 | Zimbra Collaboration Suite LDAP Filter Injection via Unescaped computeDn() Template Substitution | medium | 5.3 | No | No | No |
| CVE-2026-50055 | Zimbra Collaboration Suite Sieve Notify Filter Action Bypasses Mail Forwarding Restriction via Variable Expansion | medium | 6.5 | No | No | Yes |
| CVE-2026-50054 | Zimbra Collaboration Suite GrantRightsRequest SOAP Handler Allows Self-Granting of Undocumented loginAs Mailbox Delegation Right | high | 7.1 | No | No | Yes |
| CVE-2026-10631 | Zimbra Collaboration Suite EWS Extension Authorization Bypass via Crafted Composite Folder/Item Identifier | medium | 6.5 | No | No | Yes |
| CVE-2022-24682 | - | medium | 6.4 | Yes | Yes | Yes |
| CVE-2018-10939 | - | medium | 6.1 | No | No | No |
| CVE-2015-7610 | - | high | 8.8 | No | No | No |

## Frequently asked questions

### How many CVEs does Zimbra Collaboration Suite have?

Zimbra Collaboration Suite has 25 published CVE records since 2018.

### How many Zimbra Collaboration Suite CVEs are in CISA KEV?

1 of Zimbra Collaboration Suite's CVEs is listed in CISA's Known Exploited Vulnerabilities catalog, confirmed exploited in the wild and carrying a CISA remediation deadline.

### Are there public exploits for Zimbra Collaboration Suite vulnerabilities?

Yes — 6 of Zimbra Collaboration Suite's CVEs have a known public exploit.

### Which versions of Zimbra Collaboration Suite are affected?

11 distinct Zimbra Collaboration Suite versions are named across its CVEs. Use the version filter above to see the CVEs affecting a specific version.

### What are the most common weakness types in Zimbra Collaboration Suite CVEs?

Zimbra Collaboration Suite's CVEs most often map to these CWE weakness types: CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')), CWE-290 (Authentication Bypass by Spoofing), CWE-639 (Authorization Bypass Through User-Controlled Key), CWE-352 (Cross-Site Request Forgery (CSRF)).

### What is the average severity of Zimbra Collaboration Suite CVEs?

The average CVSS base score across Zimbra Collaboration Suite's scored CVEs is 6.3.

## Other products from this vendor

- [zm-build](https://radicalnotion.ai/vendor/zimbra/zm-build) (114 CVEs)
- [Collaboration](https://radicalnotion.ai/vendor/zimbra/collaboration) (50 CVEs)
- [zm-mailbox](https://radicalnotion.ai/vendor/zimbra/zm-mailbox) (19 CVEs)
- [zm-zcs-lib](https://radicalnotion.ai/vendor/zimbra/zm-zcs-lib) (12 CVEs)
- [zm-zcs](https://radicalnotion.ai/vendor/zimbra/zm-zcs) (11 CVEs)
- [Zimbra Collaboration Suite (ZCS)](https://radicalnotion.ai/vendor/zimbra/zimbra-collaboration-suite-zcs) (7 CVEs)
- [collaboration server](https://radicalnotion.ai/vendor/zimbra/collaboration-server) (6 CVEs)
- [Zimbra](https://radicalnotion.ai/vendor/zimbra/zimbra) (5 CVEs)

---

Source: [RadicalNotion.AI](https://radicalnotion.ai/vendor/zimbra/zimbra-collaboration-suite). Licensed CC BY-NC 4.0; attribute RadicalNotion.AI and link the source page when you reuse this data.