CVE-2026-25773 Mattermost CVE debrief

Who should care

Administrators and users of Focalboard 8.0, as well as security teams and vulnerability management teams, should be aware of this vulnerability and take necessary precautions to protect their systems. This includes applying patches or updates if available, implementing input validation and sanitization for category IDs, monitoring for suspicious activity, and implementing compensating controls.

Technical summary

Focalboard version 8.0 fails to sanitize category IDs before incorporating them into dynamic SQL statements when reordering categories. An attacker can inject a malicious SQL payload into the category id field, which is stored in the database and later executed unsanitized when the category reorder API processes the stored value. This Second-Order SQL Injection (Time-Based Blind) allows an authenticated attacker to exfiltrate sensitive data including password hashes of other users. The vulnerability occurs due to improper sanitization of user input, allowing an attacker to inject malicious SQL code.

Defensive priority

High priority should be given to patching or mitigating this vulnerability, as it allows for the exfiltration of sensitive data.

Recommended defensive actions

• Apply patches or updates to Focalboard 8.0 if available
• Implement input validation and sanitization for category IDs
• Monitor for suspicious activity and implement compensating controls
• Consider replacing Focalboard with a supported alternative
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record was published on 2026-04-03T14:16:29.127Z and was last modified on 2026-07-24T21:10:00.143Z. The NVD entry is currently Analyzed. The vulnerability affects Focalboard version 8.0. There is no official fix available as the product is no longer maintained. Users should consider replacing Focalboard with a supported alternative.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.