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CVE-2020-15864

17
FAUCET Score

CVE-2020-15864 describes a Cross-Site Scripting (XSS) vulnerability in Quali CloudShell version 9.3. An attacker can craft a malicious URL for the /Account/Login page, embedding a payload within the username field using the "constructor.constructor" substring, which then executes when a user visits the page. This vulnerability is rated Medium severity (CVSS 6.1) due to its network-based attack vector, low attack complexity, and the requirement for user interaction. Successful exploitation could lead to low impact on confidentiality and integrity, allowing for client-side script execution. Currently, there is no evidence of active exploitation, nor are there publicly available exploit modules in Metasploit or Nuclei. The CVE has received minimal community discussion and media coverage, suggesting a low level of public attention.

Impacted Technologies

VendorProductVersion(s)CPE
9.3CPE matchmatch criteria
cpe:2.3:a:quali:cloudshell:9.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.70%
Probability of exploitation in next 30 days
EPSS Percentile
49.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0070 is in the 55th percentile among its peer group of 26,219 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

burninatorsec.blogspot.com / 2020/10/cve-2020-xxxxx-xss-in-quali-cloudshell.html
ExploitThird Party Advisory
quali.com / products/cloudshell-pro
Vendor Advisory