CVE-2021-25325Public exploitNetwork attack vector

Stored XSS via unrestricted reference URL schemes

Published Jan 19, 2021 · Updated Aug 3, 2024

Stored XSS in MISP 2.4.136 allows attackers to execute JavaScript in a user's browser through a malicious Galaxy element reference. The Galaxy element index renders every refs value as an anchor href after HTML escaping but without restricting the URL scheme, so javascript URLs remain executable. An attacker must be able to add a reference and persuade an authenticated viewer to click it, enabling script execution in that viewer's MISP origin.

CVSS severity6.1
Medium
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in MISP 2.4.136 allows attackers to execute JavaScript in a user's browser through a malicious Galaxy element reference. The Galaxy element index renders every refs value as an anchor href after HTML escaping but without restricting the URL scheme, so javascript URLs remain executable. An attacker must be able to add a reference and persuade an authenticated viewer to click it, enabling script execution in that viewer's MISP origin.

The record

CVE
CVE-2021-25325
Published
Jan 19, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Jan 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS: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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

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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