CVE-2026-55665

HIGHPre-NVD 8.58.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 76% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.5Exploit: NoneExposed: 0

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

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
8.5(medium)
EPSS
24.2%
KEV
Not listed

Published

July 10, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated Jul 10, 2026
Patch available. Sources: github, github_commit, github_release.
github Patch Available

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 20× in last 7d / 20× 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. 2026-07-16 02:05 UTCEG score recompute
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 16:57 UTCEPSS rescore
  4. 2026-07-15 13:35 UTCEG score recompute
  5. 2026-07-15 02:00 UTCEPSS rescore
  6. 2026-07-15 02:00 UTCEPSS rescore
  7. 2026-07-15 01:05 UTCEG score recompute
  8. 2026-07-14 12:36 UTCEG score recompute
  9. 2026-07-14 00:07 UTCEG score recompute
  10. 2026-07-13 22:31 UTCEPSS rescore
  11. 2026-07-13 11:38 UTCEG score recompute
  12. 2026-07-13 06:13 UTCEPSS rescore
  13. 2026-07-13 06:13 UTCEPSS rescore
  14. 2026-07-12 23:07 UTCEG score recompute
  15. 2026-07-12 10:36 UTCEG score recompute
  16. 2026-07-12 05:46 UTCEPSS rescore
  17. 2026-07-11 22:03 UTCEG score recompute
  18. 2026-07-11 09:33 UTCEG score recompute
  19. 2026-07-10 21:03 UTCEG score recompute
  20. 2026-07-10 21:02 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55665?
CVE-2026-55665 is a high vulnerability 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 CVE-2026-55665 disclosed?
CVE-2026-55665 was first published in the National Vulnerability Database on July 10, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55665 actively exploited?
CVE-2026-55665 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-55665?
CVE-2026-55665 has a CVSS v3 base score of 8.5 (NVD).
How do I remediate CVE-2026-55665?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55665, 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.

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