CVE-2026-78145
CTFd __init__.py _is_safe_url redirect
- State
- Published
- Severity
- 5.3 Medium
- Published
- Aug 23, 2026
- Updated
- Aug 24, 2026
- Reserved
- Aug 23, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | 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/E:P | VulDB |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C | VulDB |
| 3.0 | 4.3 Medium | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C | VulDB |
| 2.0 | 5.0 Medium | AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C | VulDB |
Weaknesses
- CWE-601 Open Redirect
Affected Products
| Product | Versions |
|---|---|
CTFdn/a |
|
References
- VDB-394533 | CTFd __init__.py _is_safe_url redirectvdb-entrytechnical-description
- VDB-394533 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
- CVE-2026-78145 | CVE Analysis and Reportthird-party-advisory
- Submit #882469 | CTFd https://github.com/CTFd/CTFd v3.8.4 Open Redirectthird-party-advisory
- https://mblunt.dev/writeups/ctfd-open-redirect/exploit
- https://github.com/CTFd/CTFd/pull/3026issue-trackingpatch
- https://github.com/CTFd/CTFd/commit/5d8515842fd1ab2c3a9f2dde9ffca907aa334ea9patch
- https://github.com/CTFd/CTFd/releases/tag/3.8.4patch
- https://github.com/CTFd/CTFd/product
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.