Read the docs
TI-2026-40187 Aliases CVE-2026-55665

DOM-based XSS in Grist via unsanitized links, enabling privilege escalation

Priority LOW 37CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00529 45th percentileScored 2026-11-07
Fix Fixed grist-core (gristlabs): 1.7.15

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
gristlabsgrist-corebefore 1.7.151.7.15Patch availableCNA
  • grist-core Vendorgristlabs Affected before 1.7.15 Fixed in 1.7.15 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:getgrist:grist-core:*:*:*:*:*:*:*:*——gristlabs
  • cpe:2.3:a:getgrist:grist-core:*:*:*:*:*:*:*:* Versions — — ·gristlabs

Remediation

  • Fix · CNA grist-core (gristlabs) Fixed in 1.7.15

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55665

References

Other 3

  • TI-2026-19341 pyodide sandbox option is insecure CVSS 3.1CRITICAL 9.6
  • TI-2024-37319 Cross-site Scripting vulnerability through HyperLink cells in grist-core CVSS 3.1HIGH 8.1
  • TI-2024-37318 Cross-site Scripting vulnerability through svg attachment previews in grist-core CVSS 3.1HIGH 8.1
  • TI-2024-37317 Cross-site Scripting vulnerability through custom widget URLs and form redirect URLs in grist-core CVSS 3.1HIGH 8.1
  • TI-2026-40182 Grist: XSS through unsafe value interpolation in server-rendered pages CVSS 3.1HIGH 7.7
  • TI-2025-40090 grist-core has path to server-side requests via websocket CVSS 3.1MEDIUM 6.8
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences