High severity · published Oct 6, 2026
CVE-2026-105861
Payload external upload trust validation issue
8.2
CVSS
0.1%
EPSS
No
On KEV
Description
Payload is a free and open source headless content management system. In versions after 3.0.0 and before 3.90.0, authenticated external URL-based upload retrieval can forward authentication data to a redirected destination that was not verified as trusted, potentially exposing a valid session to an unintended recipient. This issue is fixed in version 3.90.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
payload · payloadcms
> 3.0.0, < 3.90.0; > 4.0.0-canary.0, < 4.0.0-canary-34 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-105861
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-105861
x_refsource_CONFIRM
https://github.com/payloadcms/payload/security/advisories/GHSA-pj5h-5q6c-3pfx
x_refsource_MISC
https://github.com/payloadcms/payload/commit/ba5cf6ae20d27a2c15106cb37466419031f86e6d
x_refsource_MISC
https://github.com/payloadcms/payload/releases/tag/v3.90.0
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