CVE-2026-12209
MEDIUMRubyLouvre avalon Template Filter index.js prototype pollution
Title source: cnaDescription
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.
References (5)
Core 5
Core References
Vdb Entry vdb-entry
VDB-370851 | RubyLouvre avalon Template Filter index.js prototype pollution
https://vuldb.com/vuln/370851
Signature, Permissions Required signature
permissions-required
VDB-370851 | CTI Indicators (IOB, IOC, TTP, IOA)
https://vuldb.com/vuln/370851/cti
Third Party Advisory third-party-advisory
CVE-2026-12209 | CVE Analysis and Report
https://vuldb.com/cve/CVE-2026-12209
Third Party Advisory third-party-advisory
Submit #832447 | RubyLouvre avalon 0.9.9 - 2.2.10 Code Injection / Prototype Pollution
https://vuldb.com/submit/832447
Scores
CVSS v3
5.3
EPSS
0.0031
EPSS Percentile
22.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-1321
CWE-94
Status
published
Products (11)
RubyLouvre/avalon
2.2.0
RubyLouvre/avalon
2.2.1
RubyLouvre/avalon
2.2.10
RubyLouvre/avalon
2.2.2
RubyLouvre/avalon
2.2.3
RubyLouvre/avalon
2.2.4
RubyLouvre/avalon
2.2.5
RubyLouvre/avalon
2.2.6
RubyLouvre/avalon
2.2.7
RubyLouvre/avalon
2.2.8
... and 1 more
Published
Jun 15, 2026
Tracked Since
Jun 15, 2026