VDB-394533 · Submit #882469 · CVE-2026-78145

CTFd up to 3.8.4 init.py _is_safe_url Next redirect

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.9	$0-$5k	1.89+

Summaryinfo

A vulnerability classified as problematic has been found in CTFd up to 3.8.4. The impacted element is the function _is_safe_url of the file CTFd/utils/validators/__init__.py. Performing a manipulation of the argument Next results in redirect. This vulnerability was named CVE-2026-78145. The attack may be initiated remotely. In addition, an exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in CTFd up to 3.8.4. This affects the function _is_safe_url of the file CTFd/utils/validators/__init__.py. The manipulation of the argument next with an unknown input leads to a redirect vulnerability. CWE is classifying the issue as CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. This is going to have an impact on integrity.

The advisory is shared at mblunt.dev. This vulnerability is uniquely identified as CVE-2026-78145. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details and a public exploit are known. MITRE ATT&CK project uses the attack technique T1204.001 for this issue.

The exploit is shared for download at mblunt.dev. It is declared as proof-of-concept.

Upgrading eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 5d8515842fd1ab2c3a9f2dde9ffca907aa334ea9 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

CTFd

Version

License

open-source

Website

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

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 3.9

VulDB Base Score: 4.3
VulDB Temp Score: 3.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Redirect
CWE: CWE-601
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: github.com
Patch: 5d8515842fd1ab2c3a9f2dde9ffca907aa334ea9

Timelineinfo

08/23/2026 Advisory disclosed
08/23/2026 +0 days VulDB entry created
08/23/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: mblunt.dev
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2026-78145 (🔒)
GCVE (CVE): GCVE-0-2026-78145
GCVE (VulDB): GCVE-100-394533
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 08/23/2026 08:33
Changes: 08/23/2026 08:33 (59)
Complete: 🔍
Submitter: mblunt
Cache ID: 216::103

Submitinfo

Accepted

Submit #882469: CTFd https://github.com/CTFd/CTFd v3.8.4 Open Redirect (by mblunt)