Vulnerability Description
Grist is spreadsheet software using Python as its formula language. Prior to 1.7.15, several server-rendered Grist pages embedded user-controlled values into the page and into inline scripts without fully escaping them, allowing cross-site scripting. On the main application page, a document's name or description, set by a document editor, is rendered into the page that other users load when opening the document. On the OAuth2 end-of-flow page, the openerOrigin request parameter was reflected back into the served page. Injected script runs in the victim's Grist origin and can act through the authenticated session, 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 Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/gristlabs/grist-core/commit/4ced8064b7ea0e1763d5a6a2588b22774
- https://github.com/gristlabs/grist-core/releases/tag/v1.7.15
- https://github.com/gristlabs/grist-core/security/advisories/GHSA-6qrq-h2h6-cw54
FAQ
What is CVE-2026-55659?
CVE-2026-55659 is a vulnerability with a CVSS score of 7.7 (HIGH). Grist is spreadsheet software using Python as its formula language. Prior to 1.7.15, several server-rendered Grist pages embedded user-controlled values into the page and into inline scripts without f...
How severe is CVE-2026-55659?
CVE-2026-55659 has been rated HIGH with a CVSS base score of 7.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55659?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.