medium Known exploitedREV. 01
CVE-2024-27443Zimbra Collaboration — calendar header injection in webmail
Zimbra Collaboration 9.0 and 10.0 do not validate the calendar header in an invitation, so a crafted e-mail runs the sender's JavaScript inside the classic webmail interface.
Read the risk
THE VITAL STATS- CVSS score
- 6.1/ 10 CVSS v3.1
- EPSS probability
- 24% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2024-08-12
- Added to KEV
- 2025-05-19
- Exploit published
- Not recorded
- Confidence
- high
- Kill chain
- execution
- MITRE ATT&CK
- T1059.007
- Severity
- medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attacker needsThe victim must open the crafted invitation in the classic webmail interface.
Fixed inZimbra Collaboration 10.0.7, Zimbra Collaboration 9.0.0 Patch 39
Behind the card
2 REFERENCESField-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-24 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-24 | claude-code | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.