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Vulnerability record · CVE-2021-27564 · published 22 February 2021

CVE-2021-27564: Appspace cross-site scripting vulnerability

Appspace · Appspace

A stored XSS issue exists in Appspace 6.2.4. After a user is authenticated and enters an XSS payload under the groups section of the network tab, it is stored as the group name. Whenever another member visits that group, this payload executes.

5.4 CVSS 3.1 Medium EPSS 0.54% · top 56.8% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score, v2 3.5
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A stored XSS issue exists in Appspace 6.2.4. After a user is authenticated and enters an XSS payload under the groups section of the network tab, it is stored as the group name. Whenever another member visits that group, this payload executes.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/viperbluff/Appspace-Ver-6.2.4-Stored-Xss ExploitThird Party Advisory
https://github.com/viperbluff/Appspace-Ver-6.2.4-Stored-Xss ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-27670Appspace SSRF via proxy jsonprequest URL parameterAppspace 6.2.4 exposes an api/v1/core/proxy/jsonprequest endpoint whose url parameter can be pointed at arbitrary destinations, producing a server-si…EPSS 61%analysed7.5CVE-2021-27990Appspace improper authentication vulnerabilityAppspace 6.2.4 is vulnerable to a broken authentication mechanism where pages such as /medianet/mail.aspx can be called directly and the framework is…EPSS 1.4%6.5CVE-2021-27704Appspace cross-site request forgery vulnerabilityAppspace 6.2.4 is affected by Incorrect Access Control via the Appspace Web Portal password reset page.EPSS 0.40%5.4CVE-2021-27989Appspace cross-site scripting vulnerabilityAppspace 6.2.4 is vulnerable to stored cross-site scripting (XSS) in multiple parameters within /medianet/sgcontentset.aspx.EPSS 0.50%6.1CVE-2026-42897Microsoft Exchange Server XSS enables spoofingMicrosoft Exchange Server and Exchange Server Subscription Edition fail to neutralize input during web page generation, a cross-site scripting flaw (…KEVEPSS 0.52%analysed6.1CVE-2025-48700Zimbra Classic UI stored XSS via crafted email HTMLZimbra Collaboration Suite Classic UI fails to properly sanitize HTML content in email messages, allowing crafted tag structures and attribute values…KEVEPSS 1.7%analysed6.1CVE-2025-66376Zimbra Collaboration Classic UI stored XSS via CSS @import in emailZimbra Collaboration Suite 10 before 10.0.18 and 10.1 before 10.1.13 allows stored cross-site scripting in the Classic UI through CSS @import directi…KEVEPSS 20%analysed6.1CVE-2025-68461Roundcube Webmail XSS via SVG animate tagRoundcube Webmail before 1.5.12 and 1.6 before 1.6.12 is vulnerable to cross-site scripting through the animate tag in an SVG document. Because the f…KEVEPSS 27%analysed

Source: NIST National Vulnerability Database (record CVE-2021-27564), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.