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CVE-2026-78145

CTFd __init__.py _is_safe_url redirect

MEDIUM
4.3
CVSS Score
Published: August 23, 2026 at 10:45 PM UTC
Updated: October 14, 2026 at 01:10 PM UTC
1 product affected across 1 vendorCTFd

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.6%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (9)

VDB EntryTechnical Description
Source: cverecord
https://vuldb.com/vuln/394533
SignaturePermissions Required
Source: cverecord
https://vuldb.com/vuln/394533/cti
Third Party Advisory
Source: cverecord
https://vuldb.com/cve/CVE-2026-78145
Third Party Advisory
Source: cverecord
https://vuldb.com/submit/882469
Exploit
Source: cverecord
https://mblunt.dev/writeups/ctfd-open-redirect/
Issue TrackingPatch
Source: cverecord
https://github.com/CTFd/CTFd/pull/3026
Patch
Source: cverecord
https://github.com/CTFd/CTFd/commit/5d8515842fd1ab2c3a9f2dde9ffca907aa334ea9
Patch
Source: cverecord
https://github.com/CTFd/CTFd/releases/tag/3.8.4

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMVulDB
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-601

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