Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Mautic core (Packagist mautic/core) versions before 2.1.1 fail to set the HttpOnly and Secure flags on session cookies. The source gives few details about how an attacker would exploit this. Upgrade to mautic/core 2.1.1 or later. Wait, I should not name the ecosystem unless confusion. Corrected version below.
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 |
|---|---|---|---|---|
| 7.5 | High | 3.0 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | GitHub Advisory Database |
- CISA KEV Not listed.
- EPSS 0.011, the 66th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:30 UTC First seen by agentprime
- 31 Oct 2026, 14:30 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-8255-qf34-44mp
- OSV: GHSA-8255-qf34-44mp
- nvd.nist.gov/vuln/detail/CVE-2017-1000046
- github.com/mautic/mautic/issues/1969
- github.com/mautic/mautic/pull/2311
- github.com/mautic/mautic/pull/2311/commits/f9e7981f4acf0d37fd935c9b9d5d09d7e1a49bc6
- github.com/mautic/mautic
- www.trustmatta.com/advisories/MATTA-2017-002.txt