CVE-2026-54393Network attack vector

Stored XSS via unvalidated Overmind homepage link

Published Jun 12, 2026 · Updated Jun 12, 2026

Stored cross-site scripting in MISP before 2.5.40 allows remote authenticated users to execute JavaScript through an Overmind homepage link. The setHomePage endpoint used setSettingInternal() to bypass homepage validation, and News/index.ctp inserted the stored path into an href without HTML escaping. The Overmind theme, an authenticated account, unread news rendering, and interaction with the crafted link are required; execution is limited to the viewing user's browser context.

CVSS severity5.1
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in MISP before 2.5.40 allows remote authenticated users to execute JavaScript through an Overmind homepage link. The setHomePage endpoint used setSettingInternal() to bypass homepage validation, and News/index.ctp inserted the stored path into an href without HTML escaping. The Overmind theme, an authenticated account, unread news rendering, and interaction with the crafted link are required; execution is limited to the viewing user's browser context.

The record

CVE
CVE-2026-54393
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
MISP Project
Product
MISP
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 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?

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

  1. Affected versionversion=0 <2.5.40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MISP Project · MISPversion=0 <2.5.40

Published CVSS scores

5.1CIRCLCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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.

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Technologies

Your stack

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Your stack

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