XSS in Groupsession
CVE-2021-20787
Cross-site scripting vulnerability in GroupSession (GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0) allows a remote attacker to inject an arbitrary script by sending a specially crafted request to a specific URL.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.006 (48.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Groupsession
- Groupsession Bycloud
- Groupsession Zion
- Japan Total System Co.,ltd. Groupsession — versions GroupSession Free edition from ver2.2.0 to the version prior to ver5.1.0, GroupSession byCloud from ver3.0.3 to the version prior to ver5.1.0, and GroupSession ZION from ver3.0.3 to the version prior to ver5.1.0
Weakness classification (CWE)
References
- groupsession.jp/info/info-news/security202107 (Vendor Advisory)
- jvn.jp/en/jp/JVN86026700/index.html (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-20787?
- CVE-2021-20787 is a medium-severity vulnerability in Groupsession, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2021-07-30.
- How severe is CVE-2021-20787?
- Medium severity. CVSS v3 base score is 4.8 out of 10.