CVE-2026-55665

HIGHPre-NVD 8.58.5
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (44th 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

Also known asEUVD-2026-43045 (ENISA EUVD)Source: ENISA EUVD

8.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Grist is spreadsheet software using Python as its formula language. Prior to 1.7.15, Grist contained two cross-site scripting vulnerabilities where an attacker-controlled value reached a link's href without scheme validation, so a javascript URL could run in a victim's Grist origin on a single click. On the account-selection page, /welcome/select-account used its next query parameter as the account buttons' link target. In document tours, the GristDocTour table's Link_URL column became a clickable button, allowing an editor of a shared document to store a javascript URL there that ran when another user opened the document and clicked the tour link. Because the script runs in the victim's authenticated session, it can call Grist APIs as the victim, reading or modifying data and changing sharing settings and access rules. A document editor could therefore escalate to owner-level access. This issue is fixed in version 1.7.15.

CVSS v3
8.5
EG Score
8.5HIGHmedium confidence
EG Risk
38
EG Risk 38/100

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)
Severity85% × 45%
Impact severity (EG Severity): CVSS 8.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 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: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
44th
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 (8.5): severity, escalated by confirmed exploitation. This CVE's 8.5 is its impact severity (EG Severity), not escalated.

EG Severity
8.5 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 2026-10-27). 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.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.

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

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.

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 10, 2026

Last Modified

October 25, 2026

Advisory Details (3)

Auto-updated Jul 10, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub advisoryMentions a patch (unverified)

DOM-based XSS in Grist via unsanitized links, enabling privilege escalation · Advisory · gristlabs/grist-core · GitHub

https://github.com/gristlabs/grist-core/security/advisories/GHSA-7f6v-vghq-34xq
GitHub release Patch Available

v1.7.15

Patch available: gristlabs/grist-core v1.7.15

https://github.com/gristlabs/grist-core/releases/tag/v1.7.15
GitHub commit Patch Available

commit 5d0a90a162b5 (gristlabs/grist-core)

Patch available: gristlabs/grist-core v1.7.15 (contains commit 5d0a90a162b5)

https://github.com/gristlabs/grist-core/commit/5d0a90a162b5125fce7e8a86fb137eee5199dbde

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 38× 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 100 of 162 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. None are among the latest 100 rows. The 62 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  3. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  5. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  6. 2026-10-27 21:03 UTCEG score recompute
  7. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  8. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  9. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  10. 2026-10-25 14:18 UTCEG score recompute
  11. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  12. 2026-10-24 10:26 UTCEG score recompute
  13. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  16. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  18. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-18 03:30 UTCEG score recompute
  20. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-10-17 03:16 UTCEG score recompute
  22. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  25. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
Show 75 more
  1. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  2. 2026-10-12 15:55 UTCEG score recompute
  3. 2026-10-11 19:38 UTCEG score recompute
  4. 2026-10-11 16:54 UTCEG score recompute
  5. 2026-10-11 14:16 UTCEG score recompute
  6. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  11. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  17. 2026-10-01 14:57 UTCEG score recompute
  18. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  19. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  21. 2026-09-28 09:45 UTCEG score recompute
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  24. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  25. 2026-09-24 11:09 UTCEG score recompute
  26. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  27. 2026-09-23 05:43 UTCEG score recompute
  28. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  29. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  30. 2026-09-18 05:16 UTCEG score recompute
  31. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  32. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  33. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  34. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  35. 2026-09-13 23:38 UTCEG score recompute
  36. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  37. 2026-09-13 08:10 UTCEG score recompute
  38. 2026-09-12 02:31 UTCEG score recompute
  39. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  40. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  41. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  42. 2026-09-08 02:42 UTCEG score recompute
  43. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  44. 2026-09-06 13:56 UTCEG score recompute
  45. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  46. 2026-09-05 21:40 UTCEG score recompute
  47. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  48. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  49. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  50. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  51. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  52. 2026-08-30 06:04 UTCEG score recompute
  53. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  54. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  55. 2026-08-27 21:39 UTCEG score recompute
  56. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  57. 2026-08-27 00:44 UTCEG score recompute
  58. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  59. 2026-08-26 03:30 UTCEG score recompute
  60. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  61. 2026-08-24 21:54 UTCEG score recompute
  62. 2026-08-23 06:15 UTCEG score recompute
  63. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  64. 2026-08-22 05:11 UTCEG score recompute
  65. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  66. 2026-08-21 03:44 UTCEG score recompute
  67. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  68. 2026-08-20 01:31 UTCEG score recompute
  69. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  70. 2026-08-18 23:09 UTCEG score recompute
  71. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  72. 2026-08-17 22:10 UTCEG score recompute
  73. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  74. 2026-08-16 21:11 UTCEG score recompute
  75. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 25th percentile

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Frequently asked(5)

What is CVE-2026-55665?
CVE-2026-55665 is a high-severity vulnerability; its CVE record was published on July 10, 2026. Grist is spreadsheet software using Python as its formula language. Prior to 1.7.15, Grist contained two cross-site scripting vulnerabilities where an attacker-controlled value reached a link's href without scheme validation, so a javascript URL could run in a victim's Grist origin on a single…
When was the CVE record for CVE-2026-55665 published?
The CVE record for CVE-2026-55665 was published on July 10, 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 25, 2026; the record at its source may have been updated since.
Is CVE-2026-55665 actively exploited?
CVE-2026-55665 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55665?
CVE-2026-55665 has a CVSS base score of 8.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55665?
A fix for CVE-2026-55665 is available: update to the fixed version the vendor names in its advisory.

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