CVE-2026-53502
Path traversal in Thumbor file_loader allows reading files outside root via filters.
Is CVE-2026-53502 being exploited?
Not confirmed. CVE-2026-53502 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-53502?
CVE-2026-53502 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-53502?
Yes. A fix has been recorded for CVE-2026-53502. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-53502 affect?
CVE-2026-53502 affects Thumbor < 7.8.0, file_loader module, instances using watermark/frame filters. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-53502?
Upgrade Thumbor to 7.8.0; validate/filter inputs and restrict FILE_LOADER_ROOT_PATH
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Directory traversal via watermark/frame filter lets attackers read arbitrary files outside FILE_LOADER_ROOT_PATH, exposing secrets and enabling further attacks.
Immediate action required
- affected< 7.8.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.