EUVD-2026-45185Severity by source
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
Unauthenticated network stored XSS (PR:N, AV:N) needs a victim to view content (UI:R) and crosses into their browser (S:C); XSS impact is partial confidentiality/integrity (C:L/I:L), not the VC:H/VI:H/VA:H the input claims.
Primary rating from Vendor (Joomla).
CVSS VectorVendor: Joomla
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
Lifecycle Timeline
2DescriptionCVE.org
The Joomla extension ChronoForms is vulnerable to an unauthenticated stored XSS vulnerability.
AnalysisAI
Stored cross-site scripting in the ChronoForms extension for Joomla lets unauthenticated attackers persist malicious JavaScript that executes in the browser of anyone who later views the affected page. The flaw carries a CVSS 4.0 base score of 8.7 and requires no authentication (PR:N), though a victim must load the poisoned content (UI:P). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a reachable ChronoForms form or endpoint that accepts unauthenticated input and later renders it back into an HTML page, and - per UI:P in the CVSS vector - a victim (such as an administrator reviewing submissions or another visitor loading the affected view) must actually load that stored content for the payload to execute; the injection itself needs no authentication (PR:N) and no elevated privileges. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals here are partly strong and partly incomplete. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker submits a ChronoForms form field containing a crafted JavaScript payload, which the extension stores and later renders without encoding. When a site administrator or another user opens the page displaying that stored data, the script executes in their browser session, enabling session/cookie theft or actions performed as the victim. … |
| Remediation | No vendor-released patch identified at time of analysis and no exact fix version is present in the input data, so administrators should monitor the ChronoEngine vendor site (https://www.chronoengine.com/) and the Joomla Vulnerable Extensions List for a patched release and upgrade as soon as one is published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Joomla instances in use and confirm whether ChronoForms is deployed; identify the current extension version and number of users impacted. …
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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