CVE-2021-27760
HCL Notes 11.0 - 11.0.1 FP4 Sametime Embedded chat clients are vulnerable to group chats loading script on restart
An issue was discovered in the Sametime chat feature in the Notes 11.0 - 11.0.1 FP4 clients. An authenticated Sametime chat user could cause Remote Code Execution on another chat client by sending a specially formatted message through chat containing Javascript code.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
HCL Notes 11.0 - 11.0.1 FP4 Sametime Embedded chat clients are vulnerable to group chats loading script on restart
An issue was discovered in the Sametime chat feature in the Notes 11.0 - 11.0.1 FP4 clients. An authenticated Sametime chat user could cause Remote Code Execution on another chat client by sending a specially formatted message through chat containing Javascript code.
- Record
CVE-2021-27760- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L - Weakness
- CWE-20
- Updated
- 2026-11-02
EUVDEUVD-2021-14501
An issue was discovered in the Sametime chat feature in the Notes 11.0 - 11.0.1 FP4 clients. An authenticated Sametime chat user could cause Remote Code Execution on another chat client by sending a specially formatted message through chat containing Javascript code.
- Record
EUVD-2021-14501- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xcf3-q63w-pqpj
An issue was discovered in the Sametime chat feature in the Notes 11.0 - 11.0.1 FP4 clients. An...
An issue was discovered in the Sametime chat feature in the Notes 11.0 - 11.0.1 FP4 clients. An authenticated Sametime chat user could cause Remote Code Execution on another chat client by sending a specially formatted message through chat containing Javascript code.
- Record
GHSA-xcf3-q63w-pqpj- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L - Weakness
- CWE-732
- Updated
- 2026-11-02
NVD
An issue was discovered in the Sametime chat feature in the Notes 11.0 - 11.0.1 FP4 clients. An authenticated Sametime chat user could cause Remote Code Execution on another chat client by sending a specially formatted message through chat containing Javascript code.
- Record
CVE-2021-27760- CVSS 3.1
- 4.6 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:L - CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L - CVSS 2.0
- 6.0 Medium
AV:N/AC:M/Au:S/C:P/I:P/A:P - Weakness
- CWE-20
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, products, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-27760 is a medium vulnerability (CVSS 4.6) in Hcl Notes, published May 6, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.73%, the 54th percentile. No source names a fixed version.