Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Thumbor versions before 7.8.0 are affected by a path traversal flaw in the file loader. The loader decodes the file path after its security check, so percent-encoded parent-directory sequences pass the check and are then resolved by the operating system, letting an attacker read files outside the image root, for example through the watermark or frame filters when unsafe URLs are allowed (the default). Upgrade to Thumbor 7.8.0 or later; the source does not list a workaround other than that.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.7 | High | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0052, the 44th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:41 UTC First seen by agentprime
- 31 Oct 2026, 14:41 UTC Confirmed by OSV