EUVD-2026-43044Severity by source
AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Editor access gives PR:L and reliable stored-XSS injection gives AC:L; a higher-privileged victim must open the doc (UI:R), script crosses the user boundary (S:C) enabling data read/modify (C:H/I:H), no availability impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N
Lifecycle Timeline
2DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Stored and reflected cross-site scripting in Grist (grist-core) prior to 1.7.15 lets a document editor inject script into a document's name or description that executes when higher-privileged users open the document, and lets attackers abuse the OAuth2 end-of-flow page's reflected openerOrigin parameter. Because the injected script runs in the victim's authenticated Grist origin, a mere document editor can read or modify data, alter sharing settings and access rules, and escalate to owner-level control. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation of the primary vector requires the attacker to already hold document-editor access to a shared Grist document (PR:L), and requires a higher-privileged user - such as the document owner - to subsequently open that document (UI:R), which is why owner escalation is possible only when such a victim views the malicious name/description. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N, base 7.7 High) captures the real profile well: network-reachable, but requiring low-privilege authentication (a document editor, PR:L), user interaction (a victim must open the malicious document, UI:R), and rated high attack complexity because a suitably privileged victim must load the payload. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with document-editor rights sets a document's name or description to an HTML/JavaScript payload; when a document owner or other user opens that document, the script runs in their authenticated Grist session and silently rewrites access rules to grant the attacker owner-level control. Alternatively, an attacker crafts a link to the OAuth2 end-of-flow page with a malicious openerOrigin value and lures a victim into clicking it to reflect and execute script. … |
| Remediation | Vendor-released patch: 1.7.15 - upgrade grist-core to version 1.7.15 or later, which adds full escaping of the affected values (see release https://github.com/gristlabs/grist-core/releases/tag/v1.7.15, commit 4ced8064b7ea0e1763d5a6a2588b22774ce7efbc, and advisory GHSA-6qrq-h2h6-cw54). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Grist deployments and identify those running versions below 1.7.15. …
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External POC / Exploit Code
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