What’s Vulnerable › Vulnerabilities

CVE-2026-55230: Vvveb: Stored XSS in Vvveb via sanitizeHTML() filter bypass using a quoted greater-than character

• Severity: high (CVSS 8.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-01 · updated 2026-10-01
• Weakness: CWE-79

Description

Vvveb is a powerful and easy to use CMS with page builder to build websites, blogs or ecommerce stores. Prior to version 1.0.8.6, Vvveb's HTML sanitizer fails to strip event-handler attributes when a tag carries a greater-than character inside a quoted attribute value. A low-privilege content author (default role author or contributor) can store a payload in post or product content that runs JavaScript in a browser of every visitor and of any administrator who views or previews that content, which opens a path to admin account takeover. This issue has been patched in version 1.0.8.6.

Affected products

• givanz Vvveb: before 1.0.8.6

References

• https://github.com/givanz/Vvveb/releases/tag/1.0.8.6
• https://github.com/givanz/Vvveb/security/advisories/GHSA-97xr-82vc-wj2v
• https://github.com/givanz/Vvveb/security/advisories/GHSA-97xr-82vc-wj2v

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