CSRF in Groupsession
CVE-2021-20786
Cross-site request forgery (CSRF) 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 hijack the authentication of administrators via a specially crafted URL.
Vulnerability class: CSRF (Cross-Site Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · 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)
Public proof-of-concept exploits
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-2021-20786?
- CVE-2021-20786 is a medium-severity vulnerability in Groupsession, classified under Cross-Site Request Forgery (CSRF). CVSS score: 4.3/10. Published 2021-07-30.
- How severe is CVE-2021-20786?
- Medium severity. CVSS v3 base score is 4.3 out of 10.
- Is CVE-2021-20786 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.