CVE-2026-25134
RCE in Group-Office CRM via zipLanguage param (pre-6.8.150/25.0.82/26.0.5)
Is CVE-2026-25134 being exploited?
Not confirmed. CVE-2026-25134 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 0.83% probability of exploitation in the next 30 days.
How severe is CVE-2026-25134?
CVE-2026-25134 is rated Critical with a CVSS score of 9.4. 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-2026-25134?
Yes. A fix has been recorded for CVE-2026-25134. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-25134 affect?
CVE-2026-25134 affects Group-Office. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-25134?
Upgrade to fixed versions: 6.8.150, 25.0.82, or 26.0.5
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via crafted ZIP upload; lang param passed to system zip via exec(), enabling arbitrary commands.
Immediate action required
- affected< 6.8.150
- affected>= 25.0.0 and < 25.0.82
- affected>= 26.0.0 and < 26.0.5
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.