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CVE-2026-115786medium6.5

Zimbra Collaboration Suite Shared-File Mailbox Quota Accounting Error Enables Quota Exhaustion

Impact

A vulnerability in Zimbra Collaboration Suite 10.1.16 and 10.1.20 allows an authenticated user to consume another user's mailbox quota by sharing and revoking a document, potentially preventing incoming mail. The issue is due to an incorrect calculation of mailbox-wide usage. An attacker needs access as an authenticated user.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

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Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Zimbra · rapid7

Zimbra Collaboration Suite

1 range
rapid7 version evidence

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affected

0 → through 10.1.20

semver versions

unaffected

unknown

Other versions: unaffected

Original source description

A mailbox quota-accounting vulnerability in Zimbra Collaboration Suite (ZCS) allows an authenticated user to consume another user’s mailbox quota by repeatedly sharing and revoking a document. Creation of the recipient’s shared-file record charges the document size to mailbox-wide usage. Revocation deletes the record and reverses its folder counters without reversing the mailbox-wide charge. Repeated normal share notifications therefore accumulate quota usage after the visible records are gone. On accounts with a finite quota, this can prevent incoming mail and other size-increasing operations without recipient interaction. The issue affects ZCS 10.1.16 and 10.1.20.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-115786

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Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-682 ↗

CWE-682 Incorrect Calculation

rapid7

Related →
Contributing organizations · 2
rapid7

Assigning organization

2026-10-23
CISA-ADP

Additional data publisher

2026-10-28

What changed

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References

2 sources
wiki.zimbra.com/wiki/Zimbra_Security_Advisories
vendor-advisoryrapid7
www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/
relatedrapid7