CVE-2026-6594
brikcss merge prototype pollution
Vexday Risk Score
33Attention
SSVC decision (CISA)
Attend
PoC available → attend closely
CVSS 6.9EPSS 0.3%KEV nãoPoC públicaNuclei —Metasploit —Patch —
Lifecycle
20 Apr 2026Published on NVD
Recommendation: Plan a near-term fix — a public PoC already exists.
A vulnerability was determined in brikcss merge up to 1.3.0. This affects an unknown part. Executing a manipulation of the argument __proto__/constructor.prototype/prototype can lead to improperly controlled modification of object prototype attributes. The attack may be performed from remote. The vendor was contacted early about this disclosure but did not respond in any way.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
Affected products
brikcss · mergepublic PoCs found — 1
cve_referencegithub.com/sudo-secure/security-research/blob/main/brikcss-merge/prototype-pollution/PoC.mdunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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