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TI-2026-83391 Aliases CVE-2026-62853

Groovy script registration in ThingLinks allows server-side code execution

Priority MEDIUM 43CWE-78Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-78.

Summary

ThingLinks, an enterprise IoT platform from mqttsnet, is affected before 1.4.0. The /groovyScriptTest/registerScript endpoint passes user-supplied Groovy script content to an unsandboxed compilation and loading flow, a flaw classified under CWE-94. An authenticated attacker with low privileges can get code compiled and run on the server, which allows arbitrary server-side code execution.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

Description from the CNA

ThingLinks is an enterprise IoT platform. Prior to 1.4.0, the `/groovyScriptTest/registerScript` endpoint accepts user-supplied Groovy script content and passes it to an unsandboxed `Groovy compilation and loading` flow. An authenticated attacker can provide code that is compiled and instantiated on the server, resulting in arbitrary server-side code execution. The issue affects the `rule engine`'s Groovy script test/register flow. This issue is fixed in version 1.4.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00406 35th percentileScored 2026-11-07
Fix Fixed thinglinks (mqttsnet): 1.4.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
mqttsnetthinglinksbefore 1.4.01.4.0Patch availableCNA
  • thinglinks Vendormqttsnet Affected before 1.4.0 Fixed in 1.4.0 Patch available CNA

Remediation

Update mqttsnet ThingLinks to version 1.4.0, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-05

  • Fix · CNA thinglinks (mqttsnet) Fixed in 1.4.0

Timeline

  1. 2026-10-30 Threatist record created from CVE-2026-62853
  2. 2026-11-06 CISA SSVC decision points changed

References

Other 3

  • TI-2026-83390 SQL injection in ThingLinks TDengine TDS APIs lets attackers alter data CVSS 3.1CRITICAL 9.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences