GHSA-99f9-gv72-fw9r: bref/bref (CVE-2024-24753)

Package	Ecosystem	Affected	Fixed in
bref/bref	Packagist	<2.1.13	2.1.13

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Bref's Packagist package bref/bref is affected in versions before 2.1.13 when used with an API Gateway v2 format. When PHP sends multiple response headers with the same name but different values, only the last one is kept, so security headers such as Content-Security-Policy can be silently dropped. The source does not describe what an attacker must do to exploit this beyond the application relying on those headers. The fix is to upgrade bref/bref to 2.1.13 or later.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
4.8	Medium	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0043, the 37th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:04 UTC First seen by agentprime
31 Oct 2026, 14:04 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.