CVE-2026-50054: high-severity vulnerability in Zimbra Collaboration Suite
Zimbra Collaboration Suite GrantRightsRequest SOAP Handler Allows Self-Granting of Undocumented loginAs Mailbox Delegation Right
Published
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.1epss 0.2%
exploitation probability
0.2%top 94% of all CVEs
observed exploitation
nono source reports it
An authorization flaw in Zimbra Collaboration Suite’s GrantRightsRequest allows an attacker with access to an authenticated account to grant another local account the loginAs right, creating persistent mailbox access and mail-sending authority that survives password changes and session expiry.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Affected products
Zimbra · Zimbra Collaboration SuiteRelated CVEs — Zimbra Collaboration Suite
In the same product, most dangerous first.
CVE-2026-50055MEDIUMZimbra Collaboration Suite Sieve Notify Filter Action Bypasses Mail Forwarding Restriction via Variable ExpansionEPSS 0.3%CVE-2026-10631MEDIUMZimbra Collaboration Suite EWS Extension Authorization Bypass via Crafted Composite Folder/Item IdentifierEPSS 0.2%CVE-2026-93637LOWZimbra Collaboration Suite GraphQL Batched Authentication Bypasses Pre-Auth Rate LimitingEPSS —CVE-2026-93635MEDIUMZimbra Collaboration Suite LDAP Filter Injection via Unescaped computeDn() Template SubstitutionEPSS —