CVE-2026-55230Public exploitNetwork attack vectorHinoki check available

Stored XSS via quoted greater-than sanitizer bypass

Published Oct 1, 2026 · Updated Oct 1, 2026

Stored XSS in givanz Vvveb 1.0.8.5 and earlier allows remote authenticated users to run JavaScript in visitors' browsers via crafted post content. The sanitizeHTML() event-handler regex treats a greater-than character inside a quoted attribute as the tag end, leaving an onerror attribute intact when stored content is rendered. An author or contributor account can plant the content; execution requires a visitor or administrator to view the post, exposing that browser's page and session context.

CVSS severity8.7
High
EPSS probability0.32%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in givanz Vvveb 1.0.8.5 and earlier allows remote authenticated users to run JavaScript in visitors' browsers via crafted post content. The sanitizeHTML() event-handler regex treats a greater-than character inside a quoted attribute as the tag end, leaving an onerror attribute intact when stored content is rendered. An author or contributor account can plant the content; execution requires a visitor or administrator to view the post, exposing that browser's page and session context.

The record

CVE
CVE-2026-55230
Published
Oct 1, 2026
Updated
Oct 1, 2026
Vendor
givanz
Product
Vvveb
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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=< 1.0.8.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

givanz · Vvvebversion=< 1.0.8.6

Published CVSS scores

8.7givanzCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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