CVE-2026-34750 json
Payload has Insufficient Filename Validation in Client-Upload Signed-URL Endpoints
published 7mo ago modified 15d ago also EUVD-2026-18019 , GHSA-frq9-7j6g-v74x
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
Payload is a free and open source headless content management system. Prior to version 3.78.0 in @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, and @payloadcms/storage-s3, the client-upload signed-URL endpoints for S3, GCS, Azure, and R2 did not properly sanitize filenames. An attacker could craft filenames to escape the intended storage location. This issue has been patched in version 3.78.0 for @payloadcms/storage-azure, @payloadcms/storage-gcs, @payloadcms/storage-r2, and @payloadcms/storage-s3.
Patch / fix
- npm @payloadcms/storage-azure 3.78.0
- npm @payloadcms/storage-gcs 3.78.0
- npm @payloadcms/storage-r2 3.78.0
- npm @payloadcms/storage-s3 3.78.0
- payloadcms payload 3.78.0
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @payloadcms/storage-azure | <3.78.0 |
3.78.0 |
| npm | @payloadcms/storage-gcs | <3.78.0 |
3.78.0 |
| npm | @payloadcms/storage-r2 | <3.78.0 |
3.78.0 |
| npm | @payloadcms/storage-s3 | <3.78.0 |
3.78.0 |
Affected products
- payloadcms payload
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
github.com
/payloadcms/payload/security/advisories/GHSA-frq9-7j6g-v74x
web, mitigation, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-34750
advisory
-
github.com
/payloadcms/payload
package
Sources
- CVE List CVE-2026-34750
- GitHub Advisory GHSA-frq9-7j6g-v74x
- NVD CVE-2026-34750
Fencer Intel 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.