Authentication Token Exposure in Amazon WorkSpaces Client for Linux
CVE-2025-12779 is a high-severity local vulnerability in the Amazon WorkSpaces client for Linux affecting versions 2023.0 through 2024.8. The issue is caused by improper handling of authentication tokens for DCV-based WorkSpaces sessions, which can expose a valid token to other local users on the same client machine. In shared or multi-user Linux environments, an unintended local user may be able to extract another user’s authentication token from the affected client host and use it to authenticate to that user’s WorkSpace. The available reporting indicates the flaw is limited to DCV-based WorkSpaces sessions; PCoIP-based clients are not affected.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A local token exposure/session isolation flaw in Amazon WorkSpaces client for Linux where improper handling of DCV-based WorkSpaces authentication tokens may allow another local user on the same machine to extract a valid token and access another user’s WorkSpace session.
A local privilege escalation vulnerability in Amazon WorkSpaces client for Linux (versions 2023.0 through 2024.8) where improper handling of authentication tokens may allow local users to extract another user's token and access their WorkSpace.
A high-severity information exposure vulnerability in Amazon WorkSpaces client for Linux that can allow a local user on a shared Linux machine to extract DCV session authentication tokens and impersonate another user to access their WorkSpace.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.