Is CVE-2026-15311 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-15311?

CVE-2026-15311 has a CVSS v3 severity of LOW (3.5).

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CVE-2026-15311

Description

A vulnerability was identified in NousResearch hermes-agent up to 2026.5.29.2. Affected by this issue is the function MatrixAdapter._markdown_to_html of the file gateway/platforms/matrix.py of the component Matrix Adapter. Such manipulation leads to cross site scripting. The attack can be executed remotely. The exploit is publicly available and might be used. The pull request to fix this issue awaits acceptance.