CVE-2026-66911
Last modified
CVE-2026-66911 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Zimbra is vulnerable to stored cross-site scripting (XSS) via the Content-Location MIME header in email attachments. Due to lack of sanitization of the Content-Location header, an attacker can set it to a javascript: URI. EPSS estimates a 0.54% chance of exploitation in the next 30 days.
Description
Zimbra is vulnerable to stored cross-site scripting (XSS) via the Content-Location MIME header in email attachments. Due to lack of sanitization of the Content-Location header, an attacker can set it to a javascript: URI. An unauthenticated remote attacker can send a crafted email to a victim; when the victim opens the email in the Zimbra web interface and clicks the attachment name, the JavaScript payload executes in the victim's browser context. This issue was fixed in version 10.1.21
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Synacor | Zimbra Collaboration | < 10.1.21 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-66911?
How severe is CVE-2026-66911?
How do I fix CVE-2026-66911?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-66903Authenticated Path Traversal in Catalog Image Management all…6.5
- CVE-2026-66906Relative path traversal vulnerability in Apache Camel Azure …9.1
- CVE-2026-66907Relative path traversal vulnerability in Apache Camel Google…7.5
- CVE-2026-66908Improper Authentication vulnerability in Apache Camel Platfo…7.5
- CVE-2026-66909Apache CXF's JMS transport deserializes the body of any inbo…9.8
- CVE-2026-6691The MongoDB C Driver's Cyrus SASL integration performs unsaf…7.8
- CVE-2026-66912Zimbra is vulnerable to Stored Cross-Site Scripting (XSS) vi…5.3
- CVE-2026-66913Lookyloo did not enforce limits on the decompressed size of …6.9
- CVE-2026-66914Joomla Extension - seblod.com - Unauthenticated path travers…9.2
- CVE-2026-66915Joomla Extension - fabrikar.com - Remote code execution in F…10
- CVE-2026-66916Joomla Extension - joomgalleryfriends.net - Password-Protect…6.9
- CVE-2026-66917Joomla Extension - joomgalleryfriends.net - Stored XSS in Jo…8.6
Are you affected by CVE-2026-66911?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST