CVE-2026-21875
ClipBucket v5 (≤5.5.2-#187) has blind SQL injection in add comment via /actions/ajax.php.
Is CVE-2026-21875 being exploited?
Not confirmed. CVE-2026-21875 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 1.5% probability of exploitation in the next 30 days.
How severe is CVE-2026-21875?
CVE-2026-21875 is rated Critical with a CVSS score of 9.8. 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-2026-21875?
Yes. A fix has been recorded for CVE-2026-21875. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-21875 affect?
CVE-2026-21875 affects ClipBucket v5 (≤5.5.2-#187). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-21875?
Disable add-comment feature until patch is released
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Blind SQL injection via obj_id in add-comment POST; possible data disclosure and DB compromise; no patch.
Immediate action required
- affected<= 5.5.2-
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.