Path Traversal Vulnerability in Thumbor by globo.com
CVE-2026-53502

8.7HIGH

Key Information:

Vendor

Thumbor

Status
Thumbor
Vendor
CVE Published:
31 July 2026

What is CVE-2026-53502?

Thumbor, an open-source photo thumbnail service developed by globo.com, suffers from a path traversal vulnerability due to improper handling of percent-encoded path segments. This issue arises when the file_loader component decodes these segments after validating the root-boundary, which can lead to unauthorized access to files outside the designated FILE_LOADER_ROOT_PATH. The vulnerability is addressed in version 7.8.0, enhancing security for users.

Affected Version(s)

thumbor < 7.8.0

References

https://github.com/thumbor/thumbor/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/thumbor/thumbor/commit/3b986d13677b30f...
x_refsource_MISC
https://github.com/thumbor/thumbor/releases/tag/7.8.0
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.