CVE-2023-49833Network attack vector

Contributor-level stored XSS via unescaped shortcode attributes

Published Dec 14, 2023 · Updated Apr 28, 2026

Stored XSS in Brainstorm Force Spectra – WordPress Gutenberg Blocks 2.7.9 and earlier allows remote authenticated users to execute scripts. Some shortcode attributes are returned into rendered page or post output without validation or escaping, allowing attacker-controlled markup to persist. Contributor-level access is required to save the payload, and another user's browser must render the affected content for script execution.

CVSS severity6.5
Medium
EPSS probability0.56%
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 Brainstorm Force Spectra – WordPress Gutenberg Blocks 2.7.9 and earlier allows remote authenticated users to execute scripts. Some shortcode attributes are returned into rendered page or post output without validation or escaping, allowing attacker-controlled markup to persist. Contributor-level access is required to save the payload, and another user's browser must render the affected content for script execution.

The record

CVE
CVE-2023-49833
Published
Dec 14, 2023
Updated
Apr 28, 2026
Vendor
Brainstorm Force
Product
Spectra Legacy – Gutenberg Blocks
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 14, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=2.7.9 changes=[{"at":"2.7.10","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Brainstorm Force · Spectra Legacy – Gutenberg Blocksversion=n/a <=2.7.9 changes=[{"at":"2.7.10","status":"unaffected"}]

Published CVSS scores

6.5PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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