CVE-2026-6594
brikcss merge prototype pollution
- State
- Published
- Severity
- 6.9 Medium
- Published
- Apr 20, 2026
- Updated
- Apr 20, 2026
- Reserved
- Apr 19, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | 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 | VulDB |
| 3.1 | 7.3 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R | VulDB |
| 3.0 | 7.3 High | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:R | VulDB |
| 2.0 | 7.5 High | AV:N/AC:L/Au:N/C:P/I:P/A:P/E:ND/RL:ND/RC:UR | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
mergebrikcss |
|
References
- VDB-358229 | brikcss merge prototype pollutionvdb-entrytechnical-description
- VDB-358229 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
- Submit #791805 | brikcss @brikcss/merge 1.3.0 Prototype Pollutionthird-party-advisory
- https://github.com/sudo-secure/security-research/blob/main/brikcss-merge/prototype-pollution/PoC.mdexploit
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