CVE-2026-78145

medium

Description

A vulnerability has been found in CTFd up to 3.8.4. The affected element is the function _is_safe_url of the file CTFd/utils/validators/__init__.py. Such manipulation of the argument Next leads to open redirect. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The name of the patch is 5d8515842fd1ab2c3a9f2dde9ffca907aa334ea9. Upgrading the affected component is recommended.

References

https://vuldb.com/vuln/394533/cti

https://vuldb.com/vuln/394533

https://vuldb.com/submit/882469

https://vuldb.com/cve/CVE-2026-78145

https://mblunt.dev/writeups/ctfd-open-redirect/

https://github.com/CTFd/CTFd/releases/tag/3.8.4

https://github.com/CTFd/CTFd/pull/3026

https://github.com/CTFd/CTFd/commit/5d8515842fd1ab2c3a9f2dde9ffca907aa334ea9

https://github.com/CTFd/CTFd/

Details

Source: Mitre, NVD

Published: 2026-08-23

Updated: 2026-08-23

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 4.3

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Severity: Medium

CVSS v4

Base Score: 5.3

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Severity: Medium