CVE-2026-55659Network attack vector

Owner-level escalation via unsafe server-page interpolation

Published Jul 10, 2026 · Updated Jul 10, 2026

Cross-site scripting in Grist before 1.7.15 allows remote authenticated users to gain owner-level access through crafted document metadata. The sendAppPage and OAuth2Clients paths interpolate document names, descriptions, and openerOrigin into HTML or inline scripts without context-aware escaping or literal replacement. A document editor must induce another user to open the document, while the OAuth flow requires a signed-in user to follow a crafted link; script then reads or modifies data and sharing rules in that user's session.

CVSS severity7.7
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Grist before 1.7.15 allows remote authenticated users to gain owner-level access through crafted document metadata. The sendAppPage and OAuth2Clients paths interpolate document names, descriptions, and openerOrigin into HTML or inline scripts without context-aware escaping or literal replacement. A document editor must induce another user to open the document, while the OAuth flow requires a signed-in user to follow a crafted link; script then reads or modifies data and sharing rules in that user's session.

The record

CVE
CVE-2026-55659
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
Grist Labs
Product
grist-core
Classifications
CWE-79, CWE-116, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.7.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Grist Labs · grist-coreversion=< 1.7.15

Published CVSS scores

7.7GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-116Improper Encoding or Escaping of Output
T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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