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Fencer Vulns
medium 6.1

CVE-2020-28351 json

The conferencing component on Mitel ShoreTel 19.46.1802.0 devices could allow an unauthenticated attacker to conduct a reflected cross-site…

published 2020-11-09 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20812

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
16.0%
EPSS 16.0% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB, plus a Nuclei check

Summary

The conferencing component on Mitel ShoreTel 19.46.1802.0 devices could allow an unauthenticated attacker to conduct a reflected cross-site scripting (XSS) attack (via the PATH_INFO to index.php) due to insufficient validation for the time_zone object in the HOME_MEETING& page.

Timeline

  1. Published
  2. First public exploit (EDB-49026)

Exploit prediction

15.99% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-49026 ShoreTel Conferencing 19.46.1802.0 - Reflected Cross-Site Scripting webapps, 2020-11-10
  • Nuclei template Mitel ShoreTel 19.46.1802.0 Devices - Cross-Site Scripting nuclei detection template
  • packetstormsecurity.com http://packetstormsecurity.com/files/159987/ShoreTel-Conferencing-19.46.1802.0-Cross-Site-Scripting.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

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.