Teamwork Cloud - Standard Edition: Deserialization of Untrusted Data
CVE-2026-7858 is a critical-severity deserialization of untrusted data vulnerability in Teamwork Cloud - Standard Edition from Dassault Systèmes, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Teamwork Cloud - Standard Edition versions: No Magic Release 2022x Golden through No Magic Release 2022x Refresh2 HF3; No Magic Release 2024x Golden through No Magic Release 2024x Refresh3 HF1; No Magic Release 2026x Golden through No Magic Release 2026x Golden HF2. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.54% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of Teamwork Cloud - Standard Edition you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on 3ds.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Dassault Systèmes | Teamwork Cloud - Standard Edition | No Magic Release 2022x Golden through No Magic Release 2022x Refresh2 HF3; No Magic Release 2024x Golden through No Magic Release 2024x Refresh3 HF1; No Magic Release 2026x Golden through No Magic Release 2026x Golden HF2 | Not stated |
| Dassault Systèmes | Teamwork Cloud - Business Edition | No Magic Release 2022x Golden through No Magic Release 2022x Refresh2 HF3; No Magic Release 2024x Golden through No Magic Release 2024x Refresh3 HF1; No Magic Release 2026x Golden through No Magic Release 2026x Golden HF2 | Not stated |
| Dassault Systèmes | Teamwork Cloud - Business Pro Edition | No Magic Release 2022x Golden through No Magic Release 2022x Refresh2 HF3; No Magic Release 2024x Golden through No Magic Release 2024x Refresh3 HF1; No Magic Release 2026x Golden through No Magic Release 2026x Golden HF2 | Not stated |
| Dassault Systèmes | Teamwork Cloud - Enterprise Edition | No Magic Release 2022x Golden through No Magic Release 2022x Refresh2 HF3; No Magic Release 2024x Golden through No Magic Release 2024x Refresh3 HF1; No Magic Release 2026x Golden through No Magic Release 2026x Golden HF2 | Not stated |
| Dassault Systèmes | Magic Collaboration Studio | CATIA Magic Release 2022x Golden through CATIA Magic Release 2022x Refresh2 HF3; CATIA Magic Release 2024x Golden through CATIA Magic Release 2024x Refresh3 HF1; CATIA Magic Release 2026x Golden through CATIA Magic Release 2026x Golden HF2 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (3ds.com).
Official description
A Deserialization of Untrusted Data vulnerability affecting Teamwork Cloud from No Magic Release 2022x through No Magic Release 2026x and Magic Collaboration Studio from CATIA Magic Release 2022x through CATIA Magic Release 2026x could lead to an unauthenticated remote code execution.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Deserialization of Untrusted Data
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
How developers prevent this class of flaw
- If available, use the signing/sealing features of the programming language to assure that deserialized data has not been tainted. For example, a hash-based message authentication code (HMAC) could be used to ensure that data has not been modified.
- When deserializing data, populate a new object rather than just deserializing. The result is that the data flows through safe input validation and that the functions are safe.
- Explicitly define a final object() to prevent deserialization.
More Deserialization of Untrusted Data vulnerabilities (CWE-502)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in Teamwork Cloud - Standard Edition
- 7.5 High severity
Recent Deserialization of Untrusted Data vulnerabilities
- 8.5 High severity
- 9.0 Critical severity
- 9.8 Critical severity
- 7.3 High severity
- 8.8 High severity
- 9.8 Critical severity
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