PatchSiren cyber security CVE debrief
CVE-2026-12209 RubyLouvre CVE debrief
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.
- Vendor
- RubyLouvre
- Product
- avalon
- CVSS
- MEDIUM 5.5
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-15
- Original CVE updated
- 2026-06-15
- Advisory published
- 2026-06-15
- Advisory updated
- 2026-06-15
Who should care
Users of RubyLouvre avalon up to 2.2.10 should be aware of this vulnerability and take necessary actions to mitigate the risk.
Technical summary
The vulnerability is caused by improper control of object prototype attributes in the Template Filter Handler component of RubyLouvre avalon up to 2.2.10. This can be exploited remotely, and the exploit has been publicly disclosed.
Defensive priority
MEDIUM
Recommended defensive actions
- Update to a version of RubyLouvre avalon that is not vulnerable.
- Implement additional security measures to detect and prevent exploitation.
Evidence notes
The CVE record and NVD detail can be found at [cve-org] and [nvd], respectively. Additional information can be found at [ref-4], [ref-5], [ref-6], [ref-7], and [ref-8].
Official resources
CVE-2026-12209 was published on 2026-06-15T03:16:24.167Z and has not been modified.