CVE-2026-39311

MEDIUMNVD 6.86.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 6.8 under NVD CVSS v3. EPSS exploit probability: 0.4% (28th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated
6.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Trilium Notes is a cross-platform, hierarchical note taking application focused on building large personal knowledge bases. Versions 0.102.1 and prior contain a critical security flaw where lack of SVG sanitization combined with a disabled Content Security Policy (CSP) and a publicly reachable backend execution API results in an unauthenticated Remote Code Execution (RCE). The vulnerability arises from an insecure-by-design architecture: Trilium serves SVG attachments with the image/svg+xml MIME type without any sanitization, and it explicitly disables Helmet's Content Security Policy middleware, removing the primary defense against script execution in served assets. Because the malicious SVG runs under the Same-Origin Policy, it can issue a fetch('/') to extract the csrfToken from the document body. With that token, it can send a signed request to /api/script/exec to execute arbitrary Node.js code on the server. An attacker can compromise the entire server instance simply by tricking an authenticated user into viewing a shared SVG attachment. The issue has been fixed in version 0.102.2.

CVSS v3
6.8
EG Score
6.8MEDIUMmedium confidence
EG Risk
47
EG Risk 47/100

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 (value × EchelonGraph’s weight)
Severity68% × 45%
The EG Score, 6.8 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 20, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Jun 14, 2026
Patch available. Sources: github_release, github.
GitHub advisoryMentions a patch (unverified)

Stored XSS Leads to Unauthorized Remote Code Execution (RCE) via Unsanitized SVG Attachments · Advisory · TriliumNext/Trilium · GitHub

https://github.com/TriliumNext/Trilium/security/advisories/GHSA-p837-cxw3-m964
GitHub release Patch Available

v0.102.2

Patch available: TriliumNext/Trilium v0.102.2

https://github.com/TriliumNext/Trilium/releases/tag/v0.102.2

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 28× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 96 of 186 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 100 are merged into the row they repeat. The 90 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  2. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  3. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  4. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  5. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  6. 2026-10-12 16:10 UTCEG score recompute
  7. 2026-10-11 19:52 UTCEG score recompute
  8. 2026-10-11 17:06 UTCEG score recompute
  9. 2026-10-11 14:32 UTCEG score recompute
  10. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  11. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  13. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  15. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  18. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  19. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  21. 2026-09-30 03:10 UTCOSV refresh
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  23. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  24. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  25. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.4% · 27th percentile
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  1. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  2. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  3. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  4. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  5. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  6. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  7. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  8. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  9. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  10. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  11. 2026-09-11 05:23 UTCOSV refresh
  12. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  13. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  14. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  15. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  16. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  17. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  18. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  19. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  20. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  21. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  22. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  23. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  24. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  25. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  26. 2026-08-23 16:52 UTCEG score recompute
  27. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  28. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  29. 2026-08-21 22:53 UTCEG score recompute
  30. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  31. 2026-08-20 18:54 UTCEG score recompute
  32. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  33. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  34. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  35. 2026-08-17 09:51 UTCEG score recompute
  36. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  37. 2026-08-16 03:29 UTCEG score recompute
  38. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  39. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  40. 2026-08-14 02:00 UTCEG score recompute
  41. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  42. 2026-08-12 20:16 UTCEG score recompute
  43. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  44. 2026-08-11 22:27 UTCEG score recompute
  45. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  46. 2026-08-11 00:34 UTCEG score recompute
  47. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  48. 2026-08-09 23:20 UTCEG score recompute
  49. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  50. 2026-08-09 01:31 UTCEG score recompute
  51. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  52. 2026-08-07 16:54 UTCEG score recompute
  53. 2026-08-06 19:05 UTCEG score recompute
  54. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  55. 2026-08-05 21:15 UTCEG score recompute
  56. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  57. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  58. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  59. 2026-08-03 16:53 UTCEG score recompute
  60. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  61. 2026-08-02 15:28 UTCEG score recompute
  62. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  63. 2026-08-01 17:38 UTCEG score recompute
  64. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  65. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  66. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  67. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  68. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  69. 2026-07-26 08:13 UTCEG score recompute
  70. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  71. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile

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Frequently asked(5)

What is CVE-2026-39311?
CVE-2026-39311 is a medium-severity vulnerability; its CVE record was published on May 20, 2026. Trilium Notes is a cross-platform, hierarchical note taking application focused on building large personal knowledge bases. Versions 0.102.1 and prior contain a critical security flaw where lack of SVG sanitization combined with a disabled Content Security Policy (CSP) and a publicly reachable…
When was the CVE record for CVE-2026-39311 published?
The CVE record for CVE-2026-39311 was published on May 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 23, 2026; the record at its source may have been updated since.
Is CVE-2026-39311 actively exploited?
CVE-2026-39311 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-39311?
CVE-2026-39311 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-39311?
A fix for CVE-2026-39311 is available: update to the fixed version the vendor names in its advisory.

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