CVE-2016-9920: roundcube webmail Improper Access Control
Vulnerability summary
CVE-2016-9920 is a high (CVSS 7.5) Improper Access Control vulnerability in roundcube webmail. EPSS estimates a 5.60% chance of exploitation in the next 30 days, higher than 92.8% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 0 · Duplicates 1 · Related 1Timeline
- 08-12-2016PublishedVulnerability first disclosed.
- 06-08-2024Last modifiedVulnerability information updated.
Description
steps/mail/sendmail.inc in Roundcube before 1.1.7 and 1.2.x before 1.2.3, when no SMTP server is configured and the sendmail program is enabled, does not properly restrict the use of custom envelope-from addresses on the sendmail command line, which allows remote authenticated users to execute arbitrary code via a modified HTTP request that sends a crafted e-mail message.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
5.60%
Chance of exploitation in the next 30 days
Percentile
93%
Versus all other CVEs
30-day change
0.00 pp
From 5.60% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (blog.ripstech.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian1 product
- roundcube< 1.2.3+dfsg.1-1 | < 0.7.2-9+deb7u5
Mageia1 product
- roundcubemail< 1.0.9-1.1.mga5
Roundcube1 product
- webmailEOL≤ 1.1.6 | 1.2.0 | 1.2.1 | 1.2.2
Ubuntu1 product
- roundcube< 1.2~beta+dfsg.1-0ubuntu1+esm7
4 vendors · 4 products
References
12 links- blog.ripstech.com/2016/roundcube-command-execution-via-email/X Refsource MISCExploitThird Party AdvisoryWEBREPORT
- www.openwall.com/lists/oss-security/2016/12/08/10Mailing ListX Refsource MLISTThird Party AdvisoryREPORT
- roundcube.net/news/2016/11/28/updates-1.2.3-and-1.1.7-releasedX Refsource CONFIRMRelease NotesVendor AdvisoryREPORT
