RubyLouvre avalon Template Filter index.js prototype pollution

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-12209
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-15 03:16:24 UTC
Updated2026-07-23 11:10:00 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v4.0 5.5 MEDIUM from [email protected]

CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.003140000 probability, percentile 0.229280000 (date 2026-06-21)

Problem Types: CWE-94 | CWE-1321 | CWE-1321 Improperly Controlled Modification of Object Prototype Attributes | CWE-94 Code Injection

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.5MEDIUMCVSS: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/C...
4.0CNADECLARED6.9MEDIUMCVSS: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
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
3.0CNADECLARED5.3MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R
2.0[email protected]Secondary5AV:N/AC:L/Au:N/C:N/I:P/A:N
2.0CNADECLARED5AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:ND/RC:UR

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA RubyLouvre Avalon affected 2.2.0 Not specified
CNA RubyLouvre Avalon affected 2.2.1 Not specified
CNA RubyLouvre Avalon affected 2.2.2 Not specified
CNA RubyLouvre Avalon affected 2.2.3 Not specified
CNA RubyLouvre Avalon affected 2.2.4 Not specified
CNA RubyLouvre Avalon affected 2.2.5 Not specified
CNA RubyLouvre Avalon affected 2.2.6 Not specified
CNA RubyLouvre Avalon affected 2.2.7 Not specified
CNA RubyLouvre Avalon affected 2.2.8 Not specified
CNA RubyLouvre Avalon affected 2.2.9 Not specified
CNA RubyLouvre Avalon affected 2.2.10 Not specified

References

ReferenceSourceLinkTags
vuldb.com/vuln/370851/cti [email protected] vuldb.com
vuldb.com/cve/CVE-2026-12209 [email protected] vuldb.com
vuldb.com/submit/832447 [email protected] vuldb.com
github.com/OriginSecurityX/avalon-filter-rce [email protected] github.com
vuldb.com/vuln/370851 [email protected] vuldb.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Frederick (VulDB User) (en)

CNA: VulDB CNA Team (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-06-14T00:00:00.000ZAdvisory disclosed
CNA2026-06-14T02:00:00.000ZVulDB entry created
CNA2026-06-14T14:32:59.000ZVulDB entry last update

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