Lin-CMS-Flask vulnerable to Improper Authentication

published 2021-08-16 5y ago modified 2026-06-17 4mo ago also GHSA-h6r2-pgvx-683c , PYSEC-2021-339 , EUVD-2021-0110

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.1%; EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits: 0; none known

Improper Authentication in Lin-CMS-Flask v0.1.1 allows remote attackers to launch brute force login attempts without restriction via the 'login' function in the component 'app/api/cms/user.py'.

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Exploit prediction

2.08% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

github.com https://github.com/TaleLin/lin-cms-flask/issues/27 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N
GitHub	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
pypi	lin-cms	1 listed version all versions	no fix listed

Classification

Weakness

CWE-307 Improper Restriction of Excessive Authentication Attempts

References

github.com /TaleLin/lin-cms-flask/issues/27
web, exploit, third-party-advisory, report
cwe.mitre.org /data/definitions/307.html
web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2020-18698
advisory
github.com /TaleLin/lin-cms-flask
package
github.com /pypa/advisory-database/tree/main/vulns/lin-cms/PYSEC-2021-339.yaml
web
github.com /advisories/GHSA-h6r2-pgvx-683c
advisory

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.