Account access denial via signup parameter tampering
Published Aug 25, 2023 · Updated Sep 30, 2024
Parameter tampering in Mattermost 7.8.8 and earlier, 7.9.0 through 7.10.4, and 8.0.0 allows remote attackers to block later account access. The signup user-creation path accepts account-state values from the request without restricting which parameters the client can set, allowing an account to be stored as inactive. Email-based account creation must be enabled, and the attacker must register the intended email first; the resulting account remains unusable until an administrator activates it.
Summary
What happened
Parameter tampering in Mattermost 7.8.8 and earlier, 7.9.0 through 7.10.4, and 8.0.0 allows remote attackers to block later account access. The signup user-creation path accepts account-state values from the request without restricting which parameters the client can set, allowing an account to be stored as inactive. Email-based account creation must be enabled, and the attacker must register the intended email first; the resulting account remains unusable until an administrator activates it.
The record
- CVE
- CVE-2023-4478
- Published
- Aug 25, 2023
- Updated
- Sep 30, 2024
- Vendor
- Mattermost
- Product
- Mattermost
- Classifications
- CWE-74, T1531
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 25, 2023CVE publishedPublication date reported by the CVE source.
- Sep 30, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=7.10.4
- Affected versionversion=0 <=7.8.8
- Affected versionversion=8.0.0
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
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo