LiveActive security incident?Get immediate response
CVE Record

CVE-2023-45207: An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15, 9.0, and 10.0.

An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15, 9.0, and 10.0. An attacker can send a PDF document through mail that contains malicious JavaScript. While previewing this file in webmail in the Chrome browser, the stored XSS payload is executed. (This has been mitigated by sanitising the JavaScript code present in a PDF document.)

MediumCVSS 6.1Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2023-45207 lets a malicious PDF sent by email run JavaScript when previewed in Zimbra webmail using Chrome. User interaction is required, but the attacker does not need an account. The expected impact is limited confidentiality and integrity risk in the webmail context.

Executive priority

Treat as a near-term webmail security update, not an emergency unless exposed Zimbra webmail is heavily used for external attachments or high-risk users.

Technical view

This is a stored cross-site scripting issue, CWE-79, in Zimbra Collaboration 8.8.15, 9.0, and 10.0. A PDF containing JavaScript can execute during Chrome-based webmail preview. The CVSS 3.1 score is 6.1, with network attack vector, low complexity, no privileges required, and required user interaction.

Likely exposure

Organizations running Zimbra Collaboration 8.8.15, 9.0, or 10.0 with webmail users who preview PDF attachments in Chrome are the likely exposure group.

Exploitation context

The source bundle does not show CISA KEV listing or public evidence of active exploitation. Exploitation depends on a user previewing a malicious PDF in webmail.

Researcher notes

Evidence is limited to the CVE description and Zimbra reference pages. The fix is described only as sanitizing JavaScript in PDF documents; no specific patched build is provided in the bundle.

Mitigation direction

  • Check Zimbra Security Advisories for fixed builds addressing CVE-2023-45207.
  • Upgrade affected ZCS deployments to the vendor-mitigated release when identified.
  • Warn users not to preview unsolicited PDFs in webmail until remediated.
  • Review vendor guidance before applying temporary PDF preview restrictions.

Validation and detection

  • Inventory Zimbra Collaboration versions across production and internet-facing mail systems.
  • Confirm whether Chrome webmail PDF preview is enabled for users.
  • Review Zimbra advisory notes for the sanitization fix covering PDF JavaScript.
  • Verify deployed builds through asset records or administrative version checks.
  • Review mail telemetry for unusual unsolicited PDF attachment campaigns.
Prepared
Confidence
high
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2023-45207 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
6.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
6.1CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.1Medium
CVSS 3.1 vector shape for CVE-2023-45207Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-79 · source CWE mapping

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs