MEDIUM
CVE-2020-8439
CWE-425Published: March 7, 2020· Updated: Jun 17, 2026
6.5
CVSS v3.1
Official Description
Monstra CMS through 3.0.4 allows remote authenticated users to take over arbitrary user accounts via a modified login parameter to an edit URI, as demonstrated by login=victim to the users/21/edit URI.
Technical Analysis
CVE-2020-8439 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 6.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
monstra1 product(s)
monstra
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (4)
→
http://uploadboy.me/cn40ne6p89t6/POC.mp4.htmlExploit · Third Party Advisory
→
https://cert.ikiu.ac.ir/public-files/pages/attachments/11/02630f153869936d555a79f89d717f9c.pdfMitigation · Third Party Advisory
→
http://uploadboy.me/cn40ne6p89t6/POC.mp4.htmlExploit · Third Party Advisory
→
https://cert.ikiu.ac.ir/public-files/pages/attachments/11/02630f153869936d555a79f89d717f9c.pdfMitigation · Third Party Advisory
Quick Facts
CVE IDCVE-2020-8439
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-425
CISA KEVNo
Affected1 vendor(s)
PublishedMar 7, 2020
Related CVEs (CWE-425)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-8439 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.