CVE-2026-5630Public exploitNetwork attack vector

Stored XSS via unsanitized Report API data

Published Apr 6, 2026 · Updated Apr 6, 2026

Stored XSS in GPT Researcher 3.4.0 through 3.4.3 allows remote attackers to execute scripts in a victim's browser via Report API input. The unauthenticated POST /api/reports and PUT /api/reports/{id} handlers store crafted report data without neutralizing it before the frontend renders the data as HTML. A victim must view the affected report, where the script runs under the application's origin and can alter browser-visible content.

CVSS severity4.3
Medium
EPSS probability0.34%
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 GPT Researcher 3.4.0 through 3.4.3 allows remote attackers to execute scripts in a victim's browser via Report API input. The unauthenticated POST /api/reports and PUT /api/reports/{id} handlers store crafted report data without neutralizing it before the frontend renders the data as HTML. A victim must view the affected report, where the script runs under the application's origin and can alter browser-visible content.

The record

CVE
CVE-2026-5630
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
Assaf Elovic
Product
GPT Researcher
Classifications
CWE-94, CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 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=3.4.0
  2. Affected versionversion=3.4.1
  3. Affected versionversion=3.4.2
  4. Affected versionversion=3.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Assaf Elovic · GPT Researcherversion=3.4.0; version=3.4.1; version=3.4.2; version=3.4.3

Published CVSS scores

2.1NVDCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
4.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
5.0NVDAV:N/AC:L/Au:N/C:N/I:P/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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