Zimbra Collaboration Suite Calendar Processing Authentication Bypass via Forged iCalendar CANCEL/REQUEST Organizer (Zimbra Zimbra Collaboration Suite)
En bref
- Source
- NVD
- EPSS
- EPSS 0.27 % · centile 19 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- rapid7
- Statut NVD
- Undergoing Analysis
Description
An organizer authentication vulnerability in the email calendar processing of Zimbra Collaboration Suite (ZCS) allows an unauthenticated sender to cancel or modify an existing meeting in a recipient's calendar. Zimbra accepts iCalendar CANCEL and REQUEST components without verifying that the email sender is authorized to act as the supplied organizer. An attacker who knows the meeting UID and organizer address can supply a non-outdated sequence number to move the recipient's meeting to Trash or replace its details. Processing occurs automatically during email delivery without recipient interaction. ZCS 10.1.16 and 10.1.21 are affected.
Faiblesses (CWE)
- CWE-290 — Contournement d'authentification par usurpation
Références
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | rapid7 |
| CVSS 3.1 | MEDIUM 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | NVD · cve@rapid7.com (Secondary) |
Références européennes
- ENISA EUVD · EUVD-2026-108963
- GCVE · GCVE-0-2026-93627
Produits affectés
| Produit | Versions |
|---|---|
| Zimbra · Zimbra Collaboration Suite | affected 0 ≤ 10.1.21 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |