CVE Watch2 de nov. de 2026

CVE-2026-115786

A mailbox quota-accounting vulnerability in Zimbra Collaboration Suite (ZCS) allows an authenticated user to consume another user’s mailbox

CVSS

6.5

Média

EPSS

0.4%

p33

KEV

—

Exploit Today

0-100

Publicado: 23 de out. de 2026 · Última mod.: 2 de nov. de 2026 · CWE-682

EPSS · 30d

0.4%EPSS · 30 dias0.4%

2026-10-252026-11-06

Descrição técnica

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.

Referências oficiais

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