High CVSS 8.7

CVE-2026-58148

Joomla Extension - chronoengine.com - Stored XSS in ChronoForms extension for Joomla 8.0 - 8.0.52 - The Joomla extension ChronoForms is vulnerable to an unauthenticated stored XSS vulnerability.

What this means

Exposure: Exploitable remotely over the network and without authentication — but only if a user opens booby-trapped content.
Impact: An attacker can read sensitive data, modify or destroy data and take the service offline.
Weakness: Attacker-supplied script runs in other users’ browsers (cross-site scripting).
Likelihood: Its EPSS score stays low: nothing points to imminent exploitation, which is no reason to leave it unpatched.

What to doFold into the next patch cycle.

Read automatically from the CVSS vector, the weakness type (CWE) and the EPSS score. The technical description above remains the one published by NIST.

Published: 17 July 2026
CVSS: 8.7 (v4.0) CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.32% probability of exploitation within 30 days · above 24% of all CVEs
Weakness: CWE-79
Sources: nvd

References

https://nvd.nist.gov/vuln/detail/CVE-2026-58148