CVE-2023-34372Network attack vector

Administrator-seeded browser script execution

Published Aug 30, 2023 · Updated Apr 28, 2026

Stored cross-site scripting in Didier Sampaolo SpamReferrerBlock 2.22 and earlier allows remote authenticated users to execute script in a visitor's browser. The CNA and Patchstack do not disclose the affected parameter, storage path, rendering locus, or missing output-encoding operation. Administrator-level access is required to store the payload, and another user must view the affected content before script executes in that browser context.

CVSS severity5.9
Medium
EPSS probability0.44%
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 Didier Sampaolo SpamReferrerBlock 2.22 and earlier allows remote authenticated users to execute script in a visitor's browser. The CNA and Patchstack do not disclose the affected parameter, storage path, rendering locus, or missing output-encoding operation. Administrator-level access is required to store the payload, and another user must view the affected content before script executes in that browser context.

The record

CVE
CVE-2023-34372
Published
Aug 30, 2023
Updated
Apr 28, 2026
Vendor
Didier Sampaolo
Product
SpamReferrerBlock
Classifications
CWE-79, CAPEC-592, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=n/a <=2.22

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Didier Sampaolo · SpamReferrerBlockversion=n/a <=2.22

Published CVSS scores

5.9PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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