CVE-2026-15311

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.36% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 28.3% of scored records. A rank, not a probability.

NVD base score

2.0 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS: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

NVD analysis status

Deferred. NVD last modified this record on 2026-07-10.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-07-09 23:45Z1 MO AGO

Last updated

2026-07-10 14:12Z1 MO AGO

Reserved

2026-07-09

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 5.1)

CNA CVSS vector

CVSS: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

Weaknesses

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base
• CWE-94Improper Control of Generation of Code ('Code Injection')Base

Data version

5.2

Document digest

9d684a971c7410a69878d333b78ac9959505270e8c2fcf343a75e2a2b8e98a8f

• vuldb.comVDB-377247 | NousResearch hermes-agent Matrix Adapter matrix.py MatrixAdapter._markdown_to_html cross site scriptinghttps://vuldb.com/vuln/377247vdb-entrytechnical-description
• vuldb.comVDB-377247 | CTI Indicators (IOB, IOC, TTP, IOA)https://vuldb.com/vuln/377247/ctisignaturepermissions-required
• vuldb.comCVE-2026-15311 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-15311third-party-advisory
• vuldb.comSubmit #852843 | NousResearch hermes-agent 2026.5.29.2 Cross-site Scripting (CWE-79)https://vuldb.com/submit/852843third-party-advisory
• github.comhttps://github.com/NousResearch/hermes-agent/issues/42667exploitissue-tracking
• github.comhttps://github.com/NousResearch/hermes-agent/pull/42759issue-trackingpatch
• github.comhttps://github.com/NousResearch/hermes-agent/product