CVE-2026-116779
Critical9.8CISA KEV — exploited in the wildFreeSWITCH: Inbound SIP MESSAGE can select the api chat proto and run FreeSWITCH API commandstitle from the CVE record
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to 1.11.3, sofia_presence_handle_sip_i_message() split the To user of an inbound SIP MESSAGE on a plus sign and treated the left side as a chat protocol selector. Selecting the api chat proto reached switch_api_execute(), allowing a peer whose MESSAGE was accepted to run FreeSWITCH API commands, including operating-system command sinks, with the daemon's privileges. Inbound chat is enabled on the stock internal and external profiles, and any authenticated profile account is sufficient; stock directory users without password material can also remove that barrier in affected configurations. The flaw permits configuration and credential disclosure, arbitrary call control, and command execution, and exploitation has been observed in the wild. This issue is fixed in version 1.11.3.
- CVSS
- 9.8v3.1
- EPSS (exploit probability)
- 2.2%82th pct
- CISA KEV
- Listed
EPSS trendFIRST daily scores, last 90 days
Daily values
| Score date | EPSS | Percentile |
|---|---|---|
| 2026-11-10 | 2.2% | 82.5% |
| 2026-11-09 | 1.3% | 70.6% |
| 2026-11-08 | 1.3% | 70.6% |
| 2026-11-07 | 1.3% | 70.6% |
| 2026-11-06 | 1.3% | 70.6% |
CISA KEV entrycatalogue 2026.11.10
- Date added
- 2026-11-09
- Federal due date
- 2026-11-12
- Known ransomware use
- Unknown
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Verbatim from the CISA KEV catalogue (CISA KEV, fetched 2026-11-11 15:43 UTC). The due date applies to US federal agencies under BOD 22-01.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Learn
Why it happened and what stops it
The weakness (CWE)
- CWE-749Exposed Dangerous Method or Function
- CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')Input is pasted into a command without escaping, so attackers append commands of their own.
- CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')Input reaches an operating-system shell, letting an attacker run any command the service can.
How attackers use it (ATT&CK)
Typical for this kind of weakness across CISA KEV exploits (CTID), not specific to this CVE.
How it's exploited
What the attacker gets
Controls that mitigate it (NIST SP 800-53)
- AC-3Access EnforcementAccess Control · mitigates 8 of these techniques
- AC-6Least PrivilegeAccess Control · mitigates 7 of these techniques
- SI-4System MonitoringSystem and Information Integrity · mitigates 7 of these techniques
- AC-2Account ManagementAccess Control · mitigates 6 of these techniques
- CM-6Configuration SettingsConfiguration Management · mitigates 6 of these techniques
- CA-7Continuous MonitoringSecurity Assessment and Authorization · mitigates 5 of these techniques
Affected products
- freeswitch freeswitch
Coverage2 articles
References
- https://github.com/signalwire/freeswitch/commit/7015f6a73ab3d67fed5fbfc277ecfb88a74c2a86
- https://github.com/signalwire/freeswitch/pull/3135
- https://github.com/signalwire/freeswitch/releases/tag/v1.11.3
- https://github.com/signalwire/freeswitch/security/advisories/GHSA-mg63-h38w-8p9p
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-116779