CVE-2026-25511
Authenticated admin can trigger SSRF via WOPI discovery to access internal hosts and read files.
Is CVE-2026-25511 being exploited?
Not confirmed. CVE-2026-25511 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 0.41% probability of exploitation in the next 30 days.
How severe is CVE-2026-25511?
CVE-2026-25511 is rated High with a CVSS score of 8.2. 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-2026-25511?
Yes. A fix has been recorded for CVE-2026-25511. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-25511 affect?
CVE-2026-25511 affects Group-Office prior to 6.8.150, Group-Office prior to 25.0.82, Group-Office prior to 26.0.5. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-25511?
Upgrade to patched releases; verify no SSRF exposure.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
SSRF allows internal host/port access and server-side file read; data exfiltration via debug output.
Patch when possible
- affected< 6.8.150
- affected< 25.0.82
- affected< 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.