CVE-2026-71981
Authenticated PHP object injection in Cypht logout allows RCE as web server.
Is CVE-2026-71981 being exploited?
Not confirmed. CVE-2026-71981 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 0.56% probability of exploitation in the next 30 days.
How severe is CVE-2026-71981?
CVE-2026-71981 is rated High with a CVSS score of 8.7. 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-2026-71981?
Yes. A fix has been recorded for CVE-2026-71981. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-71981 affect?
CVE-2026-71981 affects Cypht < 2.12.2, Cypht logout handler (back_query parameter). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-71981?
Upgrade to Cypht 2.12.2; restrict access to logout/back_query and monitor logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can send a base64 serialized payload via back_query to trigger unserialize() and achieve remote code execution as the webserver.
Immediate action required
- affected< 2.12.2
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.