CVE-2026-55659
Grist: XSS through unsafe value interpolation in server-rendered pages
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.
INFO
Published Date :
July 10, 2026, 9:16 p.m.
Last Modified :
Oct. 25, 2026, 3:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-55659
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Grist to version 1.7.15.
- Ensure all documents are properly escaped.
- Verify OAuth2 end-of-flow parameter handling.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-55659.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-55659 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-55659
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-55659 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-55659 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 25, 2026
Action Type Old Value New Value Added Translation Title: grist-core de gristlabs, Description: Grist es un software de hoja de cálculo que utiliza Python como su lenguaje de fórmulas. Antes de la versión 1.7.15, varias páginas de Grist renderizadas por el servidor incrustaban valores controlados por el usuario en la página y en scripts en línea sin escaparlos completamente, permitiendo cross-site scripting. En la página principal de la aplicación, el nombre o la descripción de un documento, establecido por un editor de documentos, se renderiza en la página que otros usuarios cargan al abrir el documento. En la página de fin de flujo de OAuth2, el parámetro de solicitud openerOrigin se reflejaba de vuelta en la página servida. El script inyectado se ejecuta en el origen de Grist de la víctima y puede actuar a través de la sesión autenticada, leyendo o modificando datos y cambiando la configuración de uso compartido y las reglas de acceso. Un editor de documentos podría, por lo tanto, escalar a acceso de nivel de propietario. Este problema está solucionado en la versión 1.7.15. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 13, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-55659', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-13T16:01:16.076169Z'} -
New CVE Received by [email protected]
Jul. 10, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'gristlabs', 'product': 'grist-core', 'versions': [{'status': 'affected', 'version': '< 1.7.15'}]}] Added 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. Added CVSS V3.1 AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N Added CWE CWE-79 Added CWE CWE-116 Added Reference https://github.com/gristlabs/grist-core/commit/4ced8064b7ea0e1763d5a6a2588b22774ce7efbc Added Reference https://github.com/gristlabs/grist-core/releases/tag/v1.7.15 Added Reference https://github.com/gristlabs/grist-core/security/advisories/GHSA-6qrq-h2h6-cw54