CVE-2026-66921

MEDIUMPre-NVD 6.36.3
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (38th 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
Trending — 3 sources updated this week

Also known asEUVD-2026-49844 (ENISA EUVD) · GHSA-vx7v-g6x3-qh2m (GitHub Security Advisories)Source: ENISA EUVD

6.3EG
EchelonGraph verdictMonitorThe upstream fix is not in a release yet: until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule, then apply it (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 6.3Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

Pivotick’s Markdown node-reference renderer failed to HTML-escape the attacker-controlled nodeName value before interpolating it into both the data-node-name attribute and the body of a generated element.

Because the node-reference tokenizer rejected only square brackets, a crafted node name could still contain quotation marks, angle brackets, or other HTML metacharacters. An attacker could therefore terminate the quoted attribute or inject additional HTML elements and event-handler attributes.

When malicious node-reference content is rendered by a consumer that does not apply DOMPurify or equivalent sanitization, arbitrary JavaScript may execute in the victim’s browser in the security context of the application. Successful exploitation requires a victim to open or render a crafted graph or note and could allow the attacker to access same-origin information, modify displayed content, or perform actions using the victim’s session.

The patch resolves the issue by applying context-appropriate HTML escaping to node names before inserting them into either HTML text or quoted attribute values. The shared escaping function now encodes ampersands, angle brackets, and both types of quotation marks.

CVSS v3
6.3
EG Score
6.3MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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)
Severity63% × 45%
Impact severity (EG Severity): CVSS 6.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (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: An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule, then apply it.
EPSS PROB
0.4%
EPSS %ILE
38th
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 (6.3): severity, escalated by confirmed exploitation. This CVE's 6.3 is its impact severity (EG Severity), not escalated.

EG Severity
6.3 MEDIUMCVSS-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
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). 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 every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.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 every mission impact level.

An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule, then apply it.

Exploitation none (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.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.

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

July 28, 2026

Last Modified

October 24, 2026

Advisory Details (1)

Auto-updated Jul 28, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
GitHub commit

commit 4c13ff2b0ec7 (Pivotick/Pivotick)

Fix landed in Pivotick/Pivotick commit 4c13ff2b0ec7 — awaiting tagged release

https://github.com/Pivotick/Pivotick/commit/4c13ff2b0ec769881b5526feddef37c0c5a08885

Vendor Advisories for CVE-2026-66921(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 45× 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 99 of 208 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 109 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  4. 2026-10-29 16:53 UTCEG score recompute
  5. 2026-10-29 16:52 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  6. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  7. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  9. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  10. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  11. 2026-10-25 14:10 UTCEG score recompute
  12. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  13. 2026-10-24 13:33 UTCEG score recompute
  14. 2026-10-24 13:33 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  15. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  16. 2026-10-22 19:36 UTCEG score recompute
  17. 2026-10-22 19:35 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  18. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  19. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  20. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  21. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  22. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  23. 2026-10-18 03:20 UTCEG score recompute
  24. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  25. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.4% · 37th percentile
Show 74 more
  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  2. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  5. 2026-10-12 15:46 UTCEG score recompute
  6. 2026-10-11 19:31 UTCEG score recompute
  7. 2026-10-11 16:46 UTCEG score recompute
  8. 2026-10-11 14:07 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  14. 2026-10-07 00:06 UTCEG score recompute
  15. 2026-10-07 00:05 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  19. 2026-10-04 07:10 UTCEG score recompute
  20. 2026-10-04 07:10 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  21. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  22. 2026-10-02 18:24 UTCEG score recompute
  23. 2026-10-02 18:24 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  24. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  25. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  26. 2026-10-01 03:44 UTCEG score recompute
  27. 2026-10-01 03:44 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  28. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  29. 2026-09-29 07:46 UTCEG score recompute
  30. 2026-09-29 07:46 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  31. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  32. 2026-09-28 03:24 UTCEG score recompute
  33. 2026-09-28 03:24 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  34. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  35. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  36. 2026-09-25 06:14 UTCEG score recompute
  37. 2026-09-25 06:14 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  38. 2026-09-23 21:56 UTCEG score recompute
  39. 2026-09-23 21:56 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  40. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  41. 2026-09-22 21:42 UTCEG score recompute
  42. 2026-09-22 21:42 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  43. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  44. 2026-09-20 05:40 UTCEG score recompute
  45. 2026-09-20 05:39 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  46. 2026-09-19 05:17 UTCEG score recompute
  47. 2026-09-19 05:17 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  48. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  49. 2026-09-18 02:07 UTCEG score recompute
  50. 2026-09-18 02:07 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  51. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  52. 2026-09-16 11:50 UTCEG score recompute
  53. 2026-09-16 11:50 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  54. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  55. 2026-09-15 08:42 UTCEG score recompute
  56. 2026-09-15 08:42 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  57. 2026-09-14 05:10 UTCEG score recompute
  58. 2026-09-14 05:10 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  59. 2026-09-13 05:50 UTCEG score recompute
  60. 2026-09-13 05:50 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  61. 2026-09-12 06:28 UTCEG score recompute
  62. 2026-09-12 06:28 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  63. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  64. 2026-09-11 07:05 UTCEG score recompute
  65. 2026-09-11 07:04 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  66. 2026-09-10 07:44 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  67. 2026-09-09 08:02 UTCEG score recompute
  68. 2026-09-09 08:02 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  69. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  70. 2026-09-07 20:56 UTCEG score recompute
  71. 2026-09-07 20:55 UTCGHSA enrichmentGHSA-vx7v-g6x3-qh2m
  72. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  73. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  74. 2026-09-06 10:56 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-66921?
CVE-2026-66921 is a medium-severity vulnerability; its CVE record was published on July 28, 2026. Pivotick’s Markdown node-reference renderer failed to HTML-escape the attacker-controlled nodeName value before interpolating it into both the data-node-name attribute and the body of a generated <span> element. Because the node-reference tokenizer rejected only square brackets, a crafted node name…
When was the CVE record for CVE-2026-66921 published?
The CVE record for CVE-2026-66921 was published on July 28, 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 October 24, 2026; the record at its source may have been updated since.
Is CVE-2026-66921 actively exploited?
CVE-2026-66921 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66921?
CVE-2026-66921 has a CVSS base score of 6.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-66921?
An upstream fix for CVE-2026-66921 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-66921 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-66921

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