A reflected Cross-Site Scripting (XSS) vulnerability exists in the mlflow/mlflow repository, specifically within the handling of the Content-Type header in POST requests. An attacker can inject malicious JavaScript code into the Content-Type header, which is then improperly reflected back to the user without adequate sanitization or escaping, leading to arbitrary JavaScript execution in the context of the victim's browser. The vulnerability is present in the mlflow/server/auth/__init__.py file, where the user-supplied Content-Type header is directly injected into a Python formatted string and returned to the user, facilitating the XSS attack.
CVE-2023-6568
This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 33.4%, top 3% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- Lower severity and no public exploit yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.1
- EG Score
- 6.1(medium)
- EPSS
- 74.0%
- KEV
- Not listed
Published
December 7, 2023
Last Modified
June 17, 2026
References (4)
- security@huntrhttps://github.com/mlflow/mlflow/commit/28ff3f94994941e038f2172c6484b65dc4db6ca1
- security@huntrhttps://huntr.com/bounties/816bdaaa-8153-4732-951e-b0d92fddf709
- af854a3a-2127-422b-91ae-364da2661108https://github.com/mlflow/mlflow/commit/28ff3f94994941e038f2172c6484b65dc4db6ca1
- af854a3a-2127-422b-91ae-364da2661108https://huntr.com/bounties/816bdaaa-8153-4732-951e-b0d92fddf709
Affected Packages
(1 across 1 ecosystem)
PyPI(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| mlflow | 0.0.1 ... v0.2.0 (97 versions) | 2.9.1 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 44× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
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- 2026-05-24 12:39 UTCEG score recompute
Publicly available exploits
(1 reference)Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
- Nucleihttp/cves/2023/CVE-2023-6568.yamlFirst seen Jan 1, 2023
Mlflow - Cross-Site Scripting
Open source ↗
Related CVEs(same CWE)
Frequently asked(5)
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