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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction Required

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction Required

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact None

Integrity Impact Partial

Availability Impact None

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
n/a CTFd affected
Version Status Constraints
3.8.0 affected —
3.8.1 affected —
3.8.2 affected —
3.8.3 affected —
3.8.4 affected —

No data.

No data.

No data.

Project Subscriptions

Vendors Products
Ctfd Subscribe
Ctfd Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/CTFd/CTFd/ cve-icon cve-icon
https://github.com/CTFd/CTFd/commit/5d8515842fd1ab2c3a9f2dde9ffca907aa334ea9 cve-icon cve-icon
https://github.com/CTFd/CTFd/pull/3026 cve-icon cve-icon
https://github.com/CTFd/CTFd/releases/tag/3.8.4 cve-icon cve-icon
https://mblunt.dev/writeups/ctfd-open-redirect/ cve-icon cve-icon
https://vuldb.com/cve/CVE-2026-78145 cve-icon cve-icon
https://vuldb.com/submit/882469 cve-icon cve-icon
https://vuldb.com/vuln/394533 cve-icon cve-icon
https://vuldb.com/vuln/394533/cti cve-icon cve-icon
History

Sun, 23 Aug 2026 23:00:00 +0000

Type Values Removed Values Added
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.
Title CTFd __init__.py _is_safe_url redirect
First Time appeared Ctfd
Ctfd ctfd
Weaknesses CWE-601
CPEs cpe:2.3:a:ctfd:ctfd:*:*:*:*:*:*:*:*
Vendors & Products Ctfd
Ctfd ctfd
References
Metrics cvssV2_0

{'score': 5, 'vector': 'AV:N/AC:L/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C'}

cvssV3_0

{'score': 4.3, 'vector': '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'}

cvssV3_1

{'score': 4.3, 'vector': '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'}

cvssV4_0

{'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/E:P'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-08-23T22:45:11.793Z

Reserved: 2026-08-23T06:27:57.055Z

Link: CVE-2026-78145

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-23T23:16:46.043

Modified: 2026-08-23T23:16:46.043

Link: CVE-2026-78145

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses