CVE-2026-52891
Wekan <9.07 avatar filename allows shell injection leading to remote code execution.
Is CVE-2026-52891 being exploited?
Not confirmed. CVE-2026-52891 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.78% probability of exploitation in the next 30 days.
How severe is CVE-2026-52891?
CVE-2026-52891 is rated Critical with a CVSS score of 9.9. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-52891?
Yes. A fix has been recorded for CVE-2026-52891. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-52891 affect?
CVE-2026-52891 affects Wekan < 9.07, Self-hosted Wekan servers, Meteor-based Wekan deployments. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-52891?
Upgrade to Wekan ≥9.07 immediately; disable avatar uploads until patched and review logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution on server via crafted avatar filename passed to child_process.exec(), attacker can run arbitrary commands as app user.
Immediate action required
- affected< 9.07
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.