CVE-2024-2445Network attack vector

Reflected XSS via unescaped HTML output

Published Mar 15, 2024 · Updated Aug 1, 2024

Reflected XSS in the Mattermost Jira plugin in affected Mattermost releases allows remote attackers to execute script in users' browsers. The plugin inserts user-controlled output into generated HTML pages without escaping special characters, so the browser treats the reflected value as active content. A Mattermost user must render the crafted response; successful exploitation runs script in the server's web origin without interrupting service.

CVSS severity6.1
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in the Mattermost Jira plugin in affected Mattermost releases allows remote attackers to execute script in users' browsers. The plugin inserts user-controlled output into generated HTML pages without escaping special characters, so the browser treats the reflected value as active content. A Mattermost user must render the crafted response; successful exploitation runs script in the server's web origin without interrupting service.

The record

CVE
CVE-2024-2445
Published
Mar 15, 2024
Updated
Aug 1, 2024
Vendor
Mattermost
Product
Mattermost
Classifications
CWE-74, CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 15, 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=8.1.0 <=8.1.9
  2. Affected versionversion=9.2.0 <=9.2.5
  3. Affected versionversion=9.3.0 <=9.3.1
  4. Affected versionversion=9.4.0 <=9.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mattermost · Mattermostversion=8.1.0 <=8.1.9; version=9.2.0 <=9.2.5; version=9.3.0 <=9.3.1; version=9.4.0 <=9.4.2

Published CVSS scores

6.1MattermostCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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.

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

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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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