@payloadcms/next has Stored XSS in Admin Panel

published 2026-04-01 7 mo ago modified 2026-10-26 13 d ago also EUVD-2026-18015 , GHSA-mmxc-95ch-2j7c

cvss: 8.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits: 0; none known

Payload is a free and open source headless content management system. Prior to version 3.78.0 in @payloadcms/next, 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. This issue has been patched in version 3.78.0.

Patch / fix

fixed in 2

npm @payloadcms/next 3.78.0
payloadcms payload 3.78.0

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 7 mo ago (2026-04-02)

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.7	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
GitHub	3.1	8.7	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	@payloadcms/next	<3.78.0	3.78.0

Affected products

payloadcms payload

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /payloadcms/payload/security/advisories/GHSA-mmxc-95ch-2j7c
web, mitigation, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-34748
advisory
github.com /payloadcms/payload
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary