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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.

PUBLISHED Reserved 2026-06-14 | Published 2026-06-15 | Updated 2026-06-15 | Assigner VulDB




MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
MEDIUM: 5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
5.0AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR

Problem types

Improperly Controlled Modification of Object Prototype Attributes

Code Injection

Product status

2.2.0
affected

2.2.1
affected

2.2.2
affected

2.2.3
affected

2.2.4
affected

2.2.5
affected

2.2.6
affected

2.2.7
affected

2.2.8
affected

2.2.9
affected

2.2.10
affected

Timeline

2026-06-14:Advisory disclosed
2026-06-14:VulDB entry created
2026-06-14:VulDB entry last update

Credits

Frederick (VulDB User) reporter

VulDB CNA Team coordinator

References

vuldb.com/vuln/370851 (VDB-370851 | RubyLouvre avalon Template Filter index.js prototype pollution) vdb-entry

vuldb.com/vuln/370851/cti (VDB-370851 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/cve/CVE-2026-12209 (CVE-2026-12209 | CVE Analysis and Report) third-party-advisory

vuldb.com/submit/832447 (Submit #832447 | RubyLouvre avalon 0.9.9 - 2.2.10 Code Injection / Prototype Pollution) third-party-advisory

github.com/OriginSecurityX/avalon-filter-rce exploit

cve.org (CVE-2026-12209)

nvd.nist.gov (CVE-2026-12209)

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