CVE-2020-37044Public exploitNetwork attack vector

Reflected XSS via unencoded GraphQL query string

Published Jan 30, 2026 · Updated Jan 30, 2026

Reflected XSS in Filigran OpenCTI 3.3.1 allows remote attackers to execute JavaScript through a crafted /graphql query URL. The /graphql GET response returns attacker-supplied query-string text in executable HTML without neutralizing script markup. Exploitation requires a victim to open the crafted URL; the script then runs in the OpenCTI browser origin and can read or modify data available to that session.

CVSS severity6.1
Medium
EPSS probability0.36%
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 Filigran OpenCTI 3.3.1 allows remote attackers to execute JavaScript through a crafted /graphql query URL. The /graphql GET response returns attacker-supplied query-string text in executable HTML without neutralizing script markup. Exploitation requires a victim to open the crafted URL; the script then runs in the OpenCTI browser origin and can read or modify data available to that session.

The record

CVE
CVE-2020-37044
Published
Jan 30, 2026
Updated
Jan 30, 2026
Vendor
Filigran
Product
OpenCTI
Classifications
CWE-79, T1566.002, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 30, 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=3.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Filigran · OpenCTIversion=3.3.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
5.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1566.002Spearphishing Link
T1059.007JavaScript/JScript

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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