CVE-2025-12779

Session hijacking via exposed authentication token

Published Nov 5, 2025 · Updated Nov 5, 2025

Token exposure in Amazon WorkSpaces client for Linux 2023.0 through 2024.8 allows local users to access another user's WorkSpace. AWS states that the client improperly handles a valid DCV authentication token but has not disclosed the storage locus or exposure operation. Exploitation requires access as another local user on the same shared client machine and a DCV-based WorkSpace; the extracted token grants access to the victim's WorkSpace.

CVSS severity8.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Token exposure in Amazon WorkSpaces client for Linux 2023.0 through 2024.8 allows local users to access another user's WorkSpace. AWS states that the client improperly handles a valid DCV authentication token but has not disclosed the storage locus or exposure operation. Exploitation requires access as another local user on the same shared client machine and a DCV-based WorkSpace; the extracted token grants access to the victim's WorkSpace.

The record

CVE
CVE-2025-12779
Published
Nov 5, 2025
Updated
Nov 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-497, T1550.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 5, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8AmazonCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
8.8AmazonCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-497Exposure of Sensitive System Information to an Unauthorized Control Sphere
T1550.001Application Access Token

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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