What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-15 · updated 2026-07-24
• Weakness: CWE-94

Description

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.

Affected products

• RubyLouvre avalon: 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5 (+5)

References

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

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