CVE-2026-55105

HIGHPre-NVD 7.77.7
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (43rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated

Also known asEUVD-2026-84172 (ENISA EUVD)Source: ENISA EUVD

7.7EG
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: 0.5%CVSS: 7.7Exploit: No code on recordExposed services: Not assessed

The CVE record names the fixed release — apply it.

Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.6.15 and 3.7.2, packages/renderer/MdToHtml/rules/fountain.ts passes HTML generated by the vendored fountain.js renderer into note output without sanitizing it. A malicious Fountain code block can therefore execute script when Fountain rendering is enabled in desktop or mobile clients, or when a note is published through Joplin Server where Fountain rendering is enabled by default. The script can read content subsequently loaded in the reused note viewer or, when published notes are served from the same domain as server content, access data available to an authenticated browser in the server origin. This issue is fixed in versions 3.6.15 and 3.7.2.

CVSS v3
7.7
EG Score
7.7HIGHmedium confidence
EG Risk
51
EG Risk 51/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity77% × 45%
Impact severity (EG Severity): CVSS 7.7 of 10. Never the KEV-floored or EPSS-lifted EG Score.
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: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
43rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.7): severity, escalated by confirmed exploitation. This CVE's 7.7 is its impact severity (EG Severity), not escalated.

EG Severity
7.7 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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

The CVE record names the fixed release. 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.

The score's inputs: 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

September 21, 2026

Last Modified

September 24, 2026

Advisory Details (3)

Auto-updated Sep 21, 2026
Fix named in the CVE record. Sources: github_commit, github_pr, github.
GitHub advisoryMentions a patch (unverified)

Fountain embeds allow arbitrary script execution in published notes and the note viewer · Advisory · laurent22/joplin · GitHub

https://github.com/laurent22/joplin/security/advisories/GHSA-f7q3-3grx-6wg9
GitHub pull request

Desktop,Mobile,Server: Fix Fountain rendering issue

Fix merged in laurent22/joplin PR #15659 on 2026-06-12 — awaiting tagged release

https://github.com/laurent22/joplin/pull/15659
GitHub commit

commit 8e0812de9d79 (laurent22/joplin)

Fix landed in laurent22/joplin commit 8e0812de9d79 — awaiting tagged release

https://github.com/laurent22/joplin/commit/8e0812de9d79d1f0698bb76a8c5d7e991df9748d

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 30× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

  1. 2026-11-13 16:53 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-11-13 09:50 UTCEchelonGraph re-scored
  3. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  4. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  6. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-11-06 14:31 UTCEchelonGraph re-scored
  11. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  16. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  17. 2026-10-30 19:13 UTCEchelonGraph re-scored
  18. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  19. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  22. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  24. 2026-10-25 14:19 UTCEchelonGraph re-scored
  25. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
Show 60 more
  1. 2026-10-23 23:54 UTCEchelonGraph re-scored
  2. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  4. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  5. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  6. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  7. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  8. 2026-10-18 03:30 UTCEchelonGraph re-scored
  9. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  10. 2026-10-17 03:34 UTCEchelonGraph re-scored
  11. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  12. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-12 15:56 UTCEchelonGraph re-scored
  17. 2026-10-11 19:39 UTCEchelonGraph re-scored
  18. 2026-10-11 16:54 UTCEchelonGraph re-scored
  19. 2026-10-11 14:17 UTCEchelonGraph re-scored
  20. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  21. 2026-10-11 01:43 UTCEchelonGraph re-scored
  22. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-10-09 22:38 UTCEchelonGraph re-scored
  24. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  25. 2026-10-08 20:15 UTCEchelonGraph re-scored
  26. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  27. 2026-10-08 07:04 UTCEchelonGraph re-scored
  28. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  29. 2026-10-07 03:56 UTCEchelonGraph re-scored
  30. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  31. 2026-10-06 01:34 UTCEchelonGraph re-scored
  32. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  33. 2026-10-05 12:18 UTCEchelonGraph re-scored
  34. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  35. 2026-10-03 20:44 UTCEchelonGraph re-scored
  36. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  37. 2026-10-02 18:17 UTCEchelonGraph re-scored
  38. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  39. 2026-10-02 05:04 UTCEchelonGraph re-scored
  40. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  41. 2026-10-01 02:41 UTCEchelonGraph re-scored
  42. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  43. 2026-09-30 00:20 UTCEchelonGraph re-scored
  44. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  45. 2026-09-29 09:21 UTCEchelonGraph re-scored
  46. 2026-09-28 20:10 UTCEchelonGraph re-scored
  47. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  48. 2026-09-27 17:37 UTCEchelonGraph re-scored
  49. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  50. 2026-09-27 04:26 UTCEchelonGraph re-scored
  51. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  52. 2026-09-26 02:02 UTCEchelonGraph re-scored
  53. 2026-09-24 23:37 UTCEchelonGraph re-scored
  54. 2026-09-24 22:57 UTCEchelonGraph re-scored
  55. 2026-09-24 21:28 UTCEchelonGraph re-scored
  56. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  57. 2026-09-22 23:39 UTCEchelonGraph re-scored
  58. 2026-09-22 10:29 UTCEchelonGraph re-scored
  59. 2026-09-21 21:17 UTCEchelonGraph re-scoredFirst assessed: 7.7 HIGH
  60. 2026-09-21 21:16 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55105?
CVE-2026-55105 is a high-severity vulnerability; its CVE record was published on September 21, 2026. Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.6.15 and 3.7.2, packages/renderer/MdToHtml/rules/fountain.ts passes HTML generated by the vendored fountain.js renderer into note output without sanitizing it. A malicious Fountain…
When was the CVE record for CVE-2026-55105 published?
The CVE record for CVE-2026-55105 was published on September 21, 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 September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-55105 actively exploited?
CVE-2026-55105 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55105?
CVE-2026-55105 has a CVSS base score of 7.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55105?
The CVE record for CVE-2026-55105 names the fix: "This issue is fixed in versions 3.6.15 and 3.7.2."

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