CVE-2026-15311

NousResearch hermes-agent Matrix Adapter matrix.py MatrixAdapter._markdown_to_html cross site scripting

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.

Affected

NousResearch · hermes-agent

CVSS v4.0 VULDB

2.0 LOWCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 VULDB

3.5 LOWCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

CVSS v2.0 VULDB

4.0 MEDIUMAV:N/AC:L/Au:S/C:N/I:P/A:N

EPSS

0.36% chance of exploitation in the next 30 days, 28th percentile

Published

2026-07-09

Updated

2026-07-10

Proof-of-concept exploits (1)

• NousResearch/hermes-agent/issues/42667252663★ · 2026-10-11

References

• CVE Record
• NVD entry

Related

• CVE-2026-14783
• CVE-2026-17432
• CVE-2026-18976
• CVE-2026-18993
• CVE-2026-7112
• CVE-2026-7113