CVE-2026-19943Network attack vector

Contributor-level stored XSS via titleTag rendering

Published Aug 25, 2026 · Updated Aug 25, 2026

Stored XSS in Jegstudio Gutenverse 4.0.2 and earlier allows remote authenticated users to execute scripts through a crafted titleTag. The chart block stores the attribute inside a block-comment delimiter, bypassing save-time wp_kses_post filtering, then do_blocks() turns it into unescaped live HTML during rendering. Contributor-level access is required; the stored script runs for page visitors and in editor or administrator preview sessions.

CVSS severity6.4
Medium
EPSS probability0.20%
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 Jegstudio Gutenverse 4.0.2 and earlier allows remote authenticated users to execute scripts through a crafted titleTag. The chart block stores the attribute inside a block-comment delimiter, bypassing save-time wp_kses_post filtering, then do_blocks() turns it into unescaped live HTML during rendering. Contributor-level access is required; the stored script runs for page visitors and in editor or administrator preview sessions.

The record

CVE
CVE-2026-19943
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
Jegstudio
Product
Gutenverse
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=0 <=4.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jegstudio · Gutenverseversion=0 <=4.0.2

Published CVSS scores

6.4Wordfence CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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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