CVE-2026-34748 — @payloadcms/next has Stored XSS in...

HIGH

@payloadcms/next has Stored XSS in Admin Panel

Published April 1, 2026Updated April 6, 2026Source: osv

Summary

### Impact A stored Cross-site Scripting (XSS) vulnerability existed in the admin panel. An authenticated user with write access to a collection could save content that, when viewed by another user, would execute in their browser. Consumers are affected if ALL of these are true: - Payload version **< v3.78.0** - At least one collection with versions enabled - An authenticated user has `create` or `update` access to that collection ### Patches This vulnerability has been patched in **v3.78.0**. Output encoding has been added to prevent user-supplied content from being interpreted as markup. Users should upgrade to **v3.78.0** or later. ### Workarounds If consumers cannot upgrade immediately: - Restrict `create` and `update` access to versioned collections to trusted roles only.

Advisory Timeline

First published April 1, 2026 (193 days ago).
Last revised April 6, 2026 — 5 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm

Update @payloadcms/next to 3.78.0 or later

npm install @payloadcms/next@3.78.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: npm (1).

Package	Ecosystem	Affected	Fixed In
@payloadcms/next	npm	All versions	3.78.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-79
Cross-site Scripting (XSS)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.7 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-34748?: @payloadcms/next has Stored XSS in Admin Panel This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.7/10).
How do I check if my project is affected by CVE-2026-34748?: CVE-2026-34748 affects @payloadcms/next. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-34748 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

8.7

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-mmxc-95ch-2j7c

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