CVE-2026-12209: Improperly Controlled Modification of Object Prototype Attributes in RubyLouvre avalon
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.
AI Analysis
Technical Summary
This vulnerability in RubyLouvre avalon (versions 2.2.0 through 2.2.10) allows an attacker to remotely manipulate object prototype attributes improperly via the Template Filter Handler component's code in src/filters/index.js. The exact function affected is unspecified. Such prototype pollution can lead to unexpected behavior or security issues in applications using the affected versions. The vulnerability has been publicly disclosed, but no vendor response or patch has been provided to date.
Potential Impact
An attacker can remotely exploit this vulnerability to modify object prototype attributes, potentially leading to altered application behavior or security bypasses. The CVSS 4.0 base score of 6.9 indicates a medium severity impact with no required privileges or user interaction, and low attack complexity. There is no indication of known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vendor has not responded and no patch is available, users should consider applying workarounds such as restricting access to vulnerable components or employing runtime protections against prototype pollution until an official fix is released.
CVE-2026-12209: Improperly Controlled Modification of Object Prototype Attributes in RubyLouvre avalon
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.
CVSS v4.0
Score 6.9medium
Affected software
pkg:npm/avaloncpe:2.3:a:rubylouvre:avalon:*:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in RubyLouvre avalon (versions 2.2.0 through 2.2.10) allows an attacker to remotely manipulate object prototype attributes improperly via the Template Filter Handler component's code in src/filters/index.js. The exact function affected is unspecified. Such prototype pollution can lead to unexpected behavior or security issues in applications using the affected versions. The vulnerability has been publicly disclosed, but no vendor response or patch has been provided to date.
Potential Impact
An attacker can remotely exploit this vulnerability to modify object prototype attributes, potentially leading to altered application behavior or security bypasses. The CVSS 4.0 base score of 6.9 indicates a medium severity impact with no required privileges or user interaction, and low attack complexity. There is no indication of known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vendor has not responded and no patch is available, users should consider applying workarounds such as restricting access to vulnerable components or employing runtime protections against prototype pollution until an official fix is released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-06-14T12:27:55.933Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a2f6c1d1cccde5f26d201d7
Added to database: 06/15/2026, 03:06:05 UTC
Last enriched: 06/15/2026, 03:20:36 UTC
Last updated: 07/31/2026, 19:22:57 UTC
Views: 77
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