PatchTheCVECVE-2026-73571: An authorization bypass vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.17 due to improper auth
CVE-2026-73571 is a low-severity flaw (CVSS 3.1) affecting zimbra collaboration suite. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An authorization bypass vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.17 due to improper authorization validation in delegated email sending functionality. An authenticated attacker can send specially crafted SOAP requests to impersonate another user and send emails without possessing the required delegation or send-as permissions. This occurs in the SaveDraftRequest SOAP handler.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 3.1 (Low) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 83%) |
| CISA exploited list | No |
| Weakness | CWE-863 |
| Published | 2026-08-13 |
| Last modified | 2026-08-28 |
Last updated 2026-08-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Advisories and coverage
Research and news
- Rapid7 Blog: From One Account to Every Mailbox: Breaking Zimbra's Identity Boundaries (Part 1) 2026-10-14
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-73571?
zimbra collaboration suite: upgrade to 10.1.17. Exact commands for each OS are on this page.
Is CVE-2026-73571 being exploited?
CVE-2026-73571 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-73571 affect?
CVE-2026-73571 affects zimbra collaboration suite. Severity is low (CVSS 3.1). An authorization bypass vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.17 due to improper authorization validation in delegated email sending functionality. An authenticated attacker can send specially crafted SOAP requests
How urgent is CVE-2026-73571?
Priority 15/100. No elevated risk signals yet.
Software pages
Related CVEs
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