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CVE-2026-55665— DOM-based XSS in Grist via unsanitized links, enabling privilege escalation

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之前版本存在跨站脚本漏洞，该漏洞源于未对链接href进行scheme验证，导致跨站脚本攻击，攻击者控制的javascript URL可在受害者点击时运行，从而在受害者认证会话中调用Grist APIs，读取或修改数据、更改共享设置和访问规则，文档编辑者可因此提升到所有者级访问权限。

AI Predicted 8.5 Difficulty: Easy EPSS 0.53% · P45

Affected Version Matrix 1

VendorProduct Version RangeStatus
gristlabs grist-core < 1.7.15 affected
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I. Basic Information for CVE-2026-55665

Vulnerability Information
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Vulnerability Title
DOM-based XSS in Grist via unsanitized links, enabling privilege escalation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA: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 跨站脚本漏洞
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之前版本存在跨站脚本漏洞，该漏洞源于未对链接href进行scheme验证，导致跨站脚本攻击，攻击者控制的javascript URL可在受害者点击时运行，从而在受害者认证会话中调用Grist APIs，读取或修改数据、更改共享设置和访问规则，文档编辑者可因此提升到所有者级访问权限。
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-2026-55665

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III. Intelligence Information for CVE-2026-55665

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Patches & Fixes for CVE-2026-55665 (1)

Vendor Advisories for CVE-2026-55665 (1)

Other References for CVE-2026-55665 (1)

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

CVE-2026-55659 7.7 HIGH Grist: XSS through unsafe value interpolation in server-rendered pages
CVE-2026-55664 4.3 MEDIUM Grist: Insufficient access control in the /forms endpoint exposes table metadata

IV. Related Vulnerabilities

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