What’s Vulnerable › Vulnerabilities

CVE-2026-6594: brikcss merge prototype pollution

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-20 · updated 2026-10-26
• Weakness: CWE-94

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.

Affected products

• brikcss merge: 1.0, 1.1, 1.2, 1.3.0

References

• https://github.com/sudo-secure/security-research/blob/main/brikcss-merge/prototype-pollution/PoC.md
• https://vuldb.com/submit/791805
• https://vuldb.com/vuln/358229
• https://vuldb.com/vuln/358229/cti

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