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CVE-2026-55659— Grist: XSS through unsafe value interpolation in server-rendered pages

Quick assessment

Affected
gristlabs grist-core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

gristlabs grist-core是gristlabs公司的一款现代关系电子表格软件。 gristlabs grist-core 1.7.15之前版本存在安全漏洞，该漏洞源于服务器渲染页面未完全转义用户控制的值，容易受到跨站脚本攻击，文档编辑者可能因此提升至所有者级权限。

CVSS 7.7 · High EPSS 0.36% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
gristlabs grist-core < 1.7.15 affected
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I. Basic Information for CVE-2026-55659

Vulnerability Information
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Vulnerability Title
Grist: XSS through unsafe value interpolation in server-rendered pages
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
gristlabs grist-core 输出处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
gristlabs grist-core是gristlabs公司的一款现代关系电子表格软件。 gristlabs grist-core 1.7.15之前版本存在安全漏洞，该漏洞源于服务器渲染页面未完全转义用户控制的值，容易受到跨站脚本攻击，文档编辑者可能因此提升至所有者级权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gristlabs grist-core < 1.7.15 -

II. Public POCs for CVE-2026-55659

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III. Intelligence Information for CVE-2026-55659

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Patches & Fixes for CVE-2026-55659 (1)

Vendor Advisories for CVE-2026-55659 (1)

Other References for CVE-2026-55659 (1)

Same Patch Batch · gristlabs · 2026-07-10 · 3 CVEs total

CVE-2026-55664 4.3 MEDIUM Grist: Insufficient access control in the /forms endpoint exposes table metadata
CVE-2026-55665 DOM-based XSS in Grist via unsanitized links, enabling privilege escalation

IV. Related Vulnerabilities

Same product: grist-core
Same vendor: gristlabs
Same weakness: CWE-79

V. Comments for CVE-2026-55659

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