Subscriber-level comment insertion via missing capability check
Published May 16, 2026 · Updated May 16, 2026
Missing authorization in Multicollab 5.2 and earlier allows remote authenticated users to add comments to arbitrary collaborations. The cf_add_comment function creates a comment for the requested collaboration without checking whether the caller has access to it. Subscriber-level access is sufficient; the demonstrated consequence is unauthorized collaboration-comment insertion, not broader content control.
Summary
What happened
Missing authorization in Multicollab 5.2 and earlier allows remote authenticated users to add comments to arbitrary collaborations. The cf_add_comment function creates a comment for the requested collaboration without checking whether the caller has access to it. Subscriber-level access is sufficient; the demonstrated consequence is unauthorized collaboration-comment insertion, not broader content control.
The record
- CVE
- CVE-2025-4202
- Published
- May 16, 2026
- Updated
- May 16, 2026
- Vendor
- Multidots
- Product
- Multicollab
- Classifications
- CWE-862, T1565.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 16, 2026CVE publishedPublication date reported by the CVE source.
- May 16, 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=0 <=5.2
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
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Technologies
Your stack
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Your stack
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