CVE-2026-40496
Last modified
CVE-2026-40496 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, attachment download tokens are generated using a weak and predictable formula: `md5(APP_KEY + attachment_id + size)`. EPSS estimates a 0.40% chance of exploitation in the next 30 days.
Description
FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.213, attachment download tokens are generated using a weak and predictable formula: `md5(APP_KEY + attachment_id + size)`. Since attachment_id is sequential and size can be brute-forced in a small range, an unauthenticated attacker can forge valid tokens and download any private attachment without credentials. Version 1.8.213 fixes the issue.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Freescout | Freescout | < 1.8.213 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-40496?
How severe is CVE-2026-40496?
How do I fix CVE-2026-40496?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-40490The AsyncHttpClient (AHC) library allows Java applications t…6.8
- CVE-2026-40491gdown is a Google Drive public file/folder downloader. Versi…7.8
- CVE-2026-40492SAIL is a cross-platform library for loading and saving imag…9.8
- CVE-2026-40493SAIL is a cross-platform library for loading and saving imag…9.8
- CVE-2026-40494SAIL is a cross-platform library for loading and saving imag…9.8
- CVE-2026-40495FOSSBilling is a free, open-source billing and client manage…6.9
- CVE-2026-40497FreeScout is a free self-hosted help desk and shared mailbox…8.1
- CVE-2026-40498FreeScout is a free self-hosted help desk and shared mailbox…9.8
- CVE-2026-40499radare2 prior to version 6.1.4 contains a command injection …7.8
- CVE-2026-40500Rejected reason: This CVE ID has been rejected or withdrawn …
- CVE-2026-40501Cherry Studio versions 1.2.2 through 1.9.12, fixed in commit…8.8
- CVE-2026-40502OpenHarness prior to commit dd1d235 contains a command injec…8.8
Are you affected by CVE-2026-40496?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST