EUVD-2026-63936
GHSA-84gv-j7pq-p96w
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/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
Network-delivered reflected XSS requires no privileges; user must click link (UI:R); scope changes to browser context (S:C); no availability impact.
Primary rating from Vendor (Joomla).
CVSS VectorVendor: Joomla
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/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
1DescriptionCVE.org
Joomla Extension - yootheme.com - Reflected XSS and open redirect via the submission redirect parameter in Zoo < 4.1.66
AnalysisAI
Reflected XSS and open redirect in yootheme.com's Zoo extension for Joomla (versions prior to 4.1.66) allow remote attackers to inject arbitrary JavaScript into a victim's browser session or redirect users to attacker-controlled URLs by crafting a malicious link containing an unsanitized submission redirect parameter. Exploitation requires a user to follow the crafted link, limiting automated mass exploitation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target Joomla installation has the yootheme.com Zoo extension installed and active at a version below 4.1.66, and that the form submission functionality exposing the redirect parameter is publicly accessible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 5.3 (Medium) accurately reflects the constrained real-world impact: the network attack vector and zero privilege requirement lower the bar for crafting malicious links, but the mandatory user interaction (UI:P) prevents fully automated exploitation and substantially reduces mass-scale risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a URL pointing to the vulnerable Joomla site's Zoo extension form submission endpoint, appending a malicious JavaScript payload or phishing URL in the redirect parameter. The attacker distributes this link via email or social engineering targeting users who trust the legitimate site. … |
| Remediation | Upgrade the Zoo extension to version 4.1.66 or later, which is the vendor-identified fix version per the Joomla security report. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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