Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
Thumbor is an open-source photo thumbnail service by globo.com. Prior to 7.8.0, Thumbor’s HMAC validation can be bypassed due to the use of Python’s .replace() when removing the signature from the URL before validation. Since .replace() removes all occurrences of the substring, an attacker can insert the same signature multiple times in the URL and manipulate the final URL used for validation. This allows crafting URLs where the validated string differs from the actual requested resource, enabling loading images from unintended domains or paths. This issue is fixed in 7.8.0.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
| Date | Total | Labels |
|---|
| 2026-07-31 | 2 | Disclosure2 |
| 2026-09-30 | 1 | Patch1 |
got "new" CVEs CVE-2026-53500 CVE-2026-53501 https://github.com/thumbor/thumbor/security/advisories/GHSA-mw3h-qjxj-6xg9 https://github.com/thumbor/thumbor/security/advisories/GHSA-6x26-6r6f-m537
Post summary
The tweet discloses two new CVEs (2026-53500, 2026-53501) and references GitHub security advisories that outline remediation such as patches.
🚨*CVE* CVE-2026-53501 Thumbor is an open-source photo thumbnail service by http://globo.com. Prior to 7.8.0, Thumbor’s HMAC validation can be bypassed due to the use of Python’s .replace() when r… https://www.cve.org/CVERecord?id=CVE-2026-53501 ----- Traducción: CVE-… http://infoflow.cloud`
Post summary
The post announces a CVE (CVE‑2026‑53501) with a brief technical detail about an HMAC bypass but provides no PoC, exploit code, active exploitation evidence, or patch information.
CVE-2026-53501 Thumbor is an open-source photo thumbnail service by http://globo.com. Prior to 7.8.0, Thumbor’s HMAC validation can be bypassed due to the use of Python’s .replace() when r… https://www.cve.org/CVERecord?id=CVE-2026-53501
Post summary
An HMAC validation bypass in Thumbor prior to version 7.8.0 is disclosed, stemming from the misuse of Python's .replace() function.