CVE-2026-15311

LOWPre-NVD 3.53.5—
EchelonGraph scoreMEDIUM confidence

Score 3.5 from GitHub Security Advisory (severity: LOW) published 2026-07-10. a secondary CVSS source baseline 3.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
3.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 3.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
3.5
EG Score
3.5(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity35% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

July 9, 2026

Last Modified

July 10, 2026

References (7)

Vendor Advisories for CVE-2026-15311(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 06:41 UTCEG score recompute
  2. 2026-08-30 06:41 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-28 21:41 UTCEPSS rescore
  5. 2026-08-27 14:25 UTCEPSS rescore
  6. 2026-08-26 14:46 UTCEPSS rescore
  7. 2026-08-25 13:48 UTCEPSS rescore
  8. 2026-08-25 13:29 UTCEG score recompute
  9. 2026-08-25 13:29 UTCGHSA enrichment
  10. 2026-08-23 00:19 UTCEPSS rescore
  11. 2026-08-22 19:49 UTCEG score recompute
  12. 2026-08-22 19:49 UTCGHSA enrichment
  13. 2026-08-21 23:49 UTCEPSS rescore
  14. 2026-08-20 22:55 UTCEPSS rescore
  15. 2026-08-20 02:16 UTCEG score recompute
  16. 2026-08-20 02:16 UTCGHSA enrichment
  17. 2026-08-19 17:03 UTCEPSS rescore
  18. 2026-08-18 13:48 UTCEPSS rescore
  19. 2026-08-17 13:47 UTCEPSS rescore
  20. 2026-08-17 08:43 UTCEG score recompute
  21. 2026-08-17 08:43 UTCGHSA enrichment
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 02:14 UTCEPSS rescore
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 15:10 UTCEG score recompute
Show 56 more
  1. 2026-08-14 15:10 UTCGHSA enrichment
  2. 2026-08-12 13:50 UTCEPSS rescore
  3. 2026-08-11 21:38 UTCEG score recompute
  4. 2026-08-11 21:38 UTCGHSA enrichment
  5. 2026-08-11 13:42 UTCEPSS rescore
  6. 2026-08-11 00:00 UTCEPSS rescore
  7. 2026-08-09 13:46 UTCEPSS rescore
  8. 2026-08-09 04:06 UTCEG score recompute
  9. 2026-08-09 04:06 UTCGHSA enrichment
  10. 2026-08-06 13:46 UTCEPSS rescore
  11. 2026-08-06 10:33 UTCEG score recompute
  12. 2026-08-06 10:33 UTCGHSA enrichment
  13. 2026-08-05 19:17 UTCEPSS rescore
  14. 2026-08-04 15:10 UTCEPSS rescore
  15. 2026-08-04 10:38 UTCEPSS rescore
  16. 2026-08-03 17:00 UTCEG score recompute
  17. 2026-08-03 17:00 UTCGHSA enrichment
  18. 2026-08-03 10:35 UTCEPSS rescore
  19. 2026-08-02 02:26 UTCEPSS rescore
  20. 2026-08-01 04:15 UTCEPSS rescore
  21. 2026-07-31 23:28 UTCEG score recompute
  22. 2026-07-31 23:27 UTCGHSA enrichment
  23. 2026-07-30 16:27 UTCEPSS rescore
  24. 2026-07-30 01:30 UTCEPSS rescore
  25. 2026-07-29 05:51 UTCEG score recompute
  26. 2026-07-29 05:51 UTCGHSA enrichment
  27. 2026-07-28 15:36 UTCEPSS rescore
  28. 2026-07-27 14:13 UTCEPSS rescore
  29. 2026-07-26 14:54 UTCEPSS rescore
  30. 2026-07-26 14:54 UTCEPSS rescore
  31. 2026-07-26 12:14 UTCEG score recompute
  32. 2026-07-26 12:14 UTCGHSA enrichment
  33. 2026-07-25 14:17 UTCEPSS rescore
  34. 2026-07-24 14:17 UTCEPSS rescore
  35. 2026-07-23 14:18 UTCEPSS rescore
  36. 2026-07-23 03:05 UTCEG score recompute
  37. 2026-07-22 14:08 UTCEPSS rescore
  38. 2026-07-21 15:24 UTCEPSS rescore
  39. 2026-07-20 17:08 UTCEPSS rescore
  40. 2026-07-19 14:30 UTCEPSS rescore
  41. 2026-07-19 02:28 UTCEPSS rescore
  42. 2026-07-18 10:04 UTCEPSS rescore
  43. 2026-07-16 17:02 UTCEPSS rescore
  44. 2026-07-15 16:57 UTCEPSS rescore
  45. 2026-07-15 11:14 UTCGHSA enrichment
  46. 2026-07-15 02:00 UTCEPSS rescore
  47. 2026-07-13 22:30 UTCEPSS rescore
  48. 2026-07-13 06:12 UTCEPSS rescore
  49. 2026-07-12 17:41 UTCGHSA enrichment
  50. 2026-07-12 05:46 UTCEPSS rescore
  51. 2026-07-11 08:27 UTCEPSS rescore
  52. 2026-07-10 16:18 UTCNVD updateCVSS v4 → 2
  53. 2026-07-10 14:42 UTCMITRE cvelistV5CVSS v4 → 5.1
  54. 2026-07-10 01:47 UTCNVD updateCVSS v4 → 2
  55. 2026-07-10 00:09 UTCEG score recompute
  56. 2026-07-10 00:07 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-15311?
CVE-2026-15311 is a low vulnerability published on July 9, 2026. A vulnerability was identified in NousResearch hermes-agent up to 2026.5.29.2. Affected by this issue is the function MatrixAdapter.markdownto_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…
When was CVE-2026-15311 disclosed?
CVE-2026-15311 was first published in the National Vulnerability Database on July 9, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15311 actively exploited?
CVE-2026-15311 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 71.6% of all scored CVEs.
What is the CVSS score of CVE-2026-15311?
CVE-2026-15311 has a CVSS v3 base score of 3.5 (NVD).
How do I remediate CVE-2026-15311?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15311, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-15311

Explore →

Is Your Infrastructure Affected by CVE-2026-15311?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs