Poll result manipulation via missing vote-count validation
Published Dec 1, 2021 · Updated Aug 4, 2024
Poll voting-limit bypass in Discourse allows remote authenticated users to cast multiple choices in single-option polls. DiscoursePoll::Poll.vote filtered submitted option digests for validity but did not compare the resulting count with the poll's single-choice limit before recording votes. A forum account and access to an open poll are required; exploitation changes poll vote records and results but does not disclose data or interrupt service.
Summary
What happened
Poll voting-limit bypass in Discourse allows remote authenticated users to cast multiple choices in single-option polls. DiscoursePoll::Poll.vote filtered submitted option digests for validity but did not compare the resulting count with the poll's single-choice limit before recording votes. A forum account and access to an open poll are required; exploitation changes poll vote records and results but does not disclose data or interrupt service.
The record
- CVE
- CVE-2021-43793
- Published
- Dec 1, 2021
- Updated
- Aug 4, 2024
- Vendor
- Discourse
- Product
- Discourse
- Classifications
- CWE-269, T1565.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 1, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record 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=stable < 2.7.11
- Affected versionversion=tests-passed < 2.8.0.beta9
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.
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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