CVE-2026-103321

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Source

https://cve.org/CVERecord?id=CVE-2026-103321

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103321.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-103321

Published

2026-09-30T12:19:01Z

Modified

2026-10-04T02:46:27Z

Severity

8.3 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:H/SI:H/SA:N CVSS Calculator

Summary

MISP Stored Cross-Site Scripting (XSS) via Unvalidated Event Graph Preview Image

Details

MISP contains a stored cross-site script (XSS) vulnerability in the event graph preview feature.

The event graph preview image field was accepted and stored without server-side validation. On the client side, the stored value was rendered into an HTML img element's src attribute via string concatenation, allowing a crafted value to break out of the attribute context and inject arbitrary script.

Preconditions:

An authenticated MISP user with the ability to create or modify an event graph entry.
A second user (the victim) who views the event graph and triggers the preview popover.

Impact:

Execution of arbitrary JavaScript in the victim's browser within the MISP application context.
Potential theft of session tokens, cookies, or sensitive data accessible to the victim's browser.
Potential for performing actions on behalf of the victim within the MISP application.

Affected: MISP versions prior to the fix (commit applied after v2.5.48).

Database specific

{
    "cna_assigner":  "CIRCL",
    "cwe_ids":  [
        "CWE-20",
        "CWE-79"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103321.json"
}

References

Affected packages

Git / github.com/misp/misp

Affected ranges

Type

GIT

Repo

https://github.com/misp/misp

Events

Introduced

Fixed

92c7ccc43

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "2.5.48"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103321.json"