CVE-2026-78003
Unauthenticated SSRF in Mailgun WordPress plugin enables API key abuse and admin takeover.
Is CVE-2026-78003 being exploited?
Not confirmed. CVE-2026-78003 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 0.87% probability of exploitation in the next 30 days.
How severe is CVE-2026-78003?
CVE-2026-78003 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-2026-78003?
Yes. A fix has been recorded for CVE-2026-78003. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-78003 affect?
CVE-2026-78003 affects Mailgun for WordPress plugin <=2.2.0, WordPress sites using Mailgun plugin, Mailgun API (abused via site API key). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-78003?
Update Mailgun plugin to patched version and rotate Mailgun API keys.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated SSRF allows attackers to use the site's Mailgun API key to create forwarding routes, intercept password resets, and hijack admin accounts.
Immediate action required
- affected<= 2.2.0
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.