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Vulnerability record · CVE-2026-55659 · published 10 July 2026

CVE-2026-55659: Cross-site scripting vulnerability

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.

7.7 CVSS 3.1 High EPSS 0.36% · top 72.4% CWE-79 · Cross-site scriptingCWE-116 · CWE-116 Deferred
7.7CVSS 3.1 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
13 Jul 2026Last modified by NVD

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:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

References

LinkTags
https://github.com/gristlabs/grist-core/commit/4ced8064b7ea0e1763d5a6a2588b22774ce7efbc
https://github.com/gristlabs/grist-core/releases/tag/v1.7.15
https://github.com/gristlabs/grist-core/security/advisories/GHSA-6qrq-h2h6-cw54

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Source: NIST National Vulnerability Database (record CVE-2026-55659), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.