CVE-2024-21838Network attack vector

HTML injection via unneutralized email output

Published Mar 5, 2024 · Updated Aug 1, 2024

HTML injection in Gallagher Command Centre Server affected releases allows remote authenticated users to alter generated emails. The email generation feature fails to neutralize special output elements before passing untrusted content into email HTML. A site must use the email feature and a recipient must render the crafted message; the reported consequence is modification of email content.

CVSS severity6.8
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML injection in Gallagher Command Centre Server affected releases allows remote authenticated users to alter generated emails. The email generation feature fails to neutralize special output elements before passing untrusted content into email HTML. A site must use the email feature and a recipient must render the crafted message; the reported consequence is modification of email content.

The record

CVE
CVE-2024-21838
Published
Mar 5, 2024
Updated
Aug 1, 2024
Vendor
Gallagher Security
Product
Command Centre
Classifications
CWE-74
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=8.60
  2. Affected versionversion=8.70 <vEL8.70.2526
  3. Affected versionversion=8.80 <vEL8.80.1526 (MR4)
  4. Affected versionversion=8.90 <vEL8.90.1751 (MR3)
  5. Affected versionversion=9.00 <vEL9.00.1774 (MR2)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Gallagher Security · Command Centreversion=0 <=8.60; version=8.70 <vEL8.70.2526; version=8.80 <vEL8.80.1526 (MR4); version=8.90 <vEL8.90.1751 (MR3); version=9.00 <vEL9.00.1774 (MR2)

Published CVSS scores

5.4NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.8Gallagher Group Ltd.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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