CVE-2026-78145CTFd __init__.py _is_safe_url redirect
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 4.3 MEDIUM (v3.1, CNA)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
- Weakness (CWE)
- CWE-601
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulDB
- NVD analysis
- Deferred
- Record last updated
- Aug 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
n/a CTFd ctfd:ctfd | 3.8.0; 3.8.1; 3.8.2; 3.8.3; 3.8.4 | CNA record |
References
- https://vuldb.com/vuln/394533vdb-entry, technical-description
- https://vuldb.com/vuln/394533/ctisignature, permissions-required
- https://vuldb.com/cve/CVE-2026-78145third-party-advisory
- https://vuldb.com/submit/882469third-party-advisory
- https://mblunt.dev/writeups/ctfd-open-redirect/exploit
- https://github.com/CTFd/CTFd/pull/3026issue-tracking, patch
- https://github.com/CTFd/CTFd/commit/5d8515842fd1ab2c3a9f2dde9ffca907aa334ea9patch
- https://github.com/CTFd/CTFd/releases/tag/3.8.4patch
- https://github.com/CTFd/CTFd/product
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.