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Description

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.

PUBLISHED Reserved 2026-04-19 | Published 2026-04-20 | Updated 2026-04-20 | Assigner VulDB




MEDIUM: 6.9CVSS: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
HIGH: 7.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R
HIGH: 7.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R
7.5AV:N/AC:L/Au:N/C:P/I:P/A:P/E:ND/RL:ND/RC:UR

Problem types

Improperly Controlled Modification of Object Prototype Attributes

Code Injection

Product status

1.0
affected

1.1
affected

1.2
affected

1.3.0
affected

Timeline

2026-04-19:Advisory disclosed
2026-04-19:VulDB entry created
2026-04-19:VulDB entry last update

Credits

sudosme (VulDB User) reporter

VulDB CNA Team coordinator

References

vuldb.com/vuln/358229 (VDB-358229 | brikcss merge prototype pollution) vdb-entry technical-description

vuldb.com/vuln/358229/cti (VDB-358229 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/submit/791805 (Submit #791805 | brikcss @brikcss/merge 1.3.0 Prototype Pollution) third-party-advisory

github.com/.../main/brikcss-merge/prototype-pollution/PoC.md exploit

cve.org (CVE-2026-6594)

nvd.nist.gov (CVE-2026-6594)

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