An email address enumeration vulnerability exists in the password reset function of Rocket.Chat through 3.9.1.

published 2021-01-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20692

cvss: 5.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 10.8%; EPSS 10.8% chance of exploitation in 30 days, percentile 95%
public exploits: 0; none known, plus a Nuclei check

Exploit prediction

10.82% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

Nuclei template Rocket.Chat <3.9.1 - Information Disclosure nuclei detection template
trovent.io https://trovent.io/security-advisory-2010-01 referenced PoC, tagged "exploit" by a source, unverified
openwall.com http://www.openwall.com/lists/oss-security/2021/01/07/1 referenced PoC, tagged "exploit" by a source, unverified
packetstormsecurity.com http://packetstormsecurity.com/files/160845/Rocket.Chat-3.7.1-Email-Address-Enumeration.html referenced PoC, tagged "exploit" by a source, unverified
openwall.com http://www.openwall.com/lists/oss-security/2021/01/08/1 referenced PoC, tagged "exploit" by a source, unverified
trovent.github.io https://trovent.github.io/security-advisories/TRSA-2010-01/TRSA-2010-01.txt referenced PoC, tagged "exploit" by a source, unverified
openwall.com http://www.openwall.com/lists/oss-security/2021/01/13/1 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

CWE-203 Observable Discrepancy

References

trovent.io /security-advisory-2010-01
exploit, third-party-advisory
openwall.com /lists/oss-security/2021/01/07/1
mailing-list, exploit, third-party-advisory
packetstormsecurity.com /files/160845/Rocket.Chat-3.7.1-Email-Address-Enumeration.html
exploit, third-party-advisory, vdb-entry
openwall.com /lists/oss-security/2021/01/08/1
mailing-list, exploit, third-party-advisory
trovent.github.io /security-advisories/TRSA-2010-01/TRSA-2010-01.txt
exploit, third-party-advisory
openwall.com /lists/oss-security/2021/01/13/1
mailing-list, exploit, third-party-advisory
seclists.org /fulldisclosure/2021/Jan/32
mailing-list, broken-link, third-party-advisory
seclists.org /fulldisclosure/2021/Jan/43
mailing-list, broken-link, third-party-advisory

Sources

CVE List CVE-2020-28208
NVD CVE-2020-28208

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary