CVE-2026-12209

MEDIUM 5.3

RubyLouvre avalon Template Filter index.js prototype pollution

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

A security vulnerability has been detected in RubyLouvre avalon up to 2.2.10. The impacted element is an unknown function of the file src/filters/index.js of the component Template Filter Handler. Such manipulation leads to improperly controlled modification of object prototype attributes. It is possible to launch the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CWE	CWE-1321 CWE-94
Vendor	rubylouvre
Product	avalon
Published	Jun 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

RubyLouvre / avalon

2.2.0 2.2.1 2.2.2 2.2.3 2.2.4 2.2.5 2.2.6 2.2.7 2.2.8 2.2.9 2.2.10

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/370851 vuldb.com: https://vuldb.com/vuln/370851/cti vuldb.com: https://vuldb.com/cve/CVE-2026-12209 vuldb.com: https://vuldb.com/submit/832447 github.com: https://github.com/OriginSecurityX/avalon-filter-rce

Credits

🔍 Frederick (VulDB User) VulDB CNA Team