Medium 5.3Published Jun 14, 2026

CVE-2026-12209RubyLouvre avalon Template Filter index.js prototype pollution

Updated under an hour ago (Oct 27, 2026, 11:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for RubyLouvre avalon

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CNA)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
Weakness (CWE): CWE-1321, CWE-94
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Deferred
Record last updated: Jun 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

RubyLouvre avalon 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; and 3 more ranges	CNA record

References

References

https://vuldb.com/vuln/370851	vdb-entry
https://vuldb.com/vuln/370851/cti	signature, permissions-required
https://vuldb.com/cve/CVE-2026-12209	third-party-advisory
https://vuldb.com/submit/832447	third-party-advisory
https://github.com/OriginSecurityX/avalon-filter-rce	exploit

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.