Authenticated data-export theft via upload mass assignment
Published Jun 24, 2026 · Updated Jun 24, 2026
Mass assignment in Rocket.Chat allows remote authenticated users to read other users' cloud-hosted data exports through crafted upload metadata. The sendFileMessage DDP method forwards every attacker-supplied file field except _id to Uploads.updateFileComplete, whose Object.assign result becomes the MongoDB $set payload without a field allowlist. Exploitation requires a regular account, an S3 or Google Cloud Storage upload backend, and a target user with an existing export at the predictable object path.
Summary
What happened
Mass assignment in Rocket.Chat allows remote authenticated users to read other users' cloud-hosted data exports through crafted upload metadata. The sendFileMessage DDP method forwards every attacker-supplied file field except _id to Uploads.updateFileComplete, whose Object.assign result becomes the MongoDB $set payload without a field allowlist. Exploitation requires a regular account, an S3 or Google Cloud Storage upload backend, and a target user with an existing export at the predictable object path.
The record
- CVE
- CVE-2026-45687
- Published
- Jun 24, 2026
- Updated
- Jun 24, 2026
- Vendor
- Rocket.Chat Technologies Corp.
- Product
- Rocket.Chat
- Classifications
- CWE-915, T1530
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 24, 2026CVE publishedPublication date reported by the CVE source.
- Jun 24, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 7.10.11
- Affected versionversion=>= 7.11.0-rc.0, < 7.13.7
- Affected versionversion=>= 8.0.0-rc.0, < 8.0.5
- Affected versionversion=>= 8.1.0-rc.0, < 8.1.4
- Affected versionversion=>= 8.2.0-rc.0, < 8.2.3
- Affected versionversion=>= 8.3.0-rc.0, < 8.3.3
- Affected versionversion=>= 8.4.0-rc.0, < 8.4.1
- Affected versionversion=>= 8.5.0-rc.0, < 8.5.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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