CVE-2026-88859Network attack vector

JavaScript execution via spoofed vCard iframe source

Published Sep 10, 2026 · Updated Sep 10, 2026

Script injection in Evolution on Red Hat Enterprise Linux 7, 8, and 9 allows remote attackers to execute JavaScript through an HTML email. A trusted vCard control handler assigns an attacker-controlled JavaScript URL directly to an iframe source, bypassing mail script restrictions. The victim must open the crafted message and click the spoofed control, after which script runs in the mail-viewing context.

CVSS severityUnavailable
Unscored
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Script injection in Evolution on Red Hat Enterprise Linux 7, 8, and 9 allows remote attackers to execute JavaScript through an HTML email. A trusted vCard control handler assigns an attacker-controlled JavaScript URL directly to an iframe source, bypassing mail script restrictions. The victim must open the crafted message and click the spoofed control, after which script runs in the mail-viewing context.

The record

CVE
CVE-2026-88859
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 7
Classifications
T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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