Quick answers
- Is CVE-2026-101158 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-101158 being exploited in the wild.
- How severe is CVE-2026-101158?
- High severity, with a CVSS score of 8.4, published 6 October 2026.
- Which products and versions are affected?
- Arista CloudVision CUE on-premises versions shipped with affected CloudVision Portal releases; Arista Cloudvision Portal 2026.2.0, 2026.1.2 and below in 2026.1.x, 2025.3.3 and below in 2025.3.x, all prior releases.
- Is there a fix for CVE-2026-101158?
- Yes: fixed in CloudVision Portal 2026.2.1 and later in 2026.2.x, 2026.1.3 and later in 2026.1.x, 2025.3.4 and later in 2025.3.x. Until then: Restrict roles with file upload permissions (Read and Write access to Bug Alert Management, File Packaging, and Image Repository) to trusted users only. Review role assignments in Settings → Roles and Settings → Users to remove upload permissions from non-essential accounts. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-101158 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-101158?
- Check whether you run Arista CloudVision CUE or Arista Cloudvision Portal at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: CloudVision Portal 2026.2.1 and later in 2026.2.x, 2026.1.3 and later in 2026.1.x, 2025.3.4 and later in 2025.3.x
Restrict roles with file upload permissions (Read and Write access to Bug Alert Management, File Packaging, and Image Repository) to trusted users only. Review role assignments in Settings → Roles and Settings → Users to remove upload permissions from non-essential accounts.
Technical details
A stored cross-site scripting (CWE-79) vulnerability in the Fileserver upload API of CloudVision Portal allows authenticated users with file upload privileges to inject unvalidated input that persists and executes in other users' browsers. The attack requires network access and user interaction (another user must view the uploaded file), but results in session hijacking and account compromise. Patches are available in all affected release trains.
Affected products
- Arista CloudVision Portal 2026.2.0, 2026.1.2 and below in 2026.1.x, 2025.3.3 and below in 2025.3.x, all prior releases
- Arista CloudVision CUE on-premises versions shipped with affected CloudVision Portal releases
Timeline
- 2026-10-06: disclosed