CVE-2026-66494: Joomla Extension - joomshaper.com - Unauthenticated stored XSS in Shapes API endpoint SP Page Builder < 6.7.0

Q: How do I fix CVE-2026-66494?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Q: Is CVE-2026-66494 being exploited?

CVE-2026-66494 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-66494 affect?

CVE-2026-66494 affects affected software. Severity is high (CVSS 8.7). Joomla Extension - joomshaper.com - Unauthenticated stored XSS in Shapes API endpoint SP Page Builder < 6.7.0 - An unauthenticated attacker can store malicious JavaScript in a Joomla site's database via a single HTTP request. When an admini

This month

HIGH 8.7

CVE-2026-66494 is a high-severity flaw (CVSS 8.7) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Joomla Extension - joomshaper.com - Unauthenticated stored XSS in Shapes API endpoint SP Page Builder < 6.7.0 - An unauthenticated attacker can store malicious JavaScript in a Joomla site's database via a single HTTP request. When an administrator opens the SP Page Builder editor, the JavaScript executes in their browser automatically..

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Passive
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-79, CWE-284
Published	2026-08-07
Last modified	2026-10-23

Publisher (CNA): Joomla! Project

Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Timeline

2026-08-07 13:16 UTCPublished CVE record published
2026-10-23 23:10 UTCUpdated Record last modified

Exact fixes by distribution

Fedora 46 · kwin-zones · FIXED · 1.0.13-1.fc46 · FEDORA-2026-95888f332b · source

sudo dnf upgrade --advisory=FEDORA-2026-95888f332b

Fedora ELN · nginx-mod-brotli · FIXED · 1.0.0~rc-16.eln159 · FEDORA-2026-501a6a8273 · source

sudo dnf upgrade --advisory=FEDORA-2026-501a6a8273

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-66494?

No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.

Is CVE-2026-66494 being exploited?

CVE-2026-66494 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-66494 affect?

CVE-2026-66494 affects affected software. Severity is high (CVSS 8.7). Joomla Extension - joomshaper.com - Unauthenticated stored XSS in Shapes API endpoint SP Page Builder < 6.7.0 - An unauthenticated attacker can store malicious JavaScript in a Joomla site's database via a single HTTP request. When an admini

How urgent is CVE-2026-66494?

Priority 41/100. High severity

Software pages

Joomla vulnerabilities

References

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