Affects GitHub Enterprise Server, a widely deployed enterprise product; enables privilege escalation to management endpoints.
CVE-2026-18730
Unauthenticated SSRF in GitHub Enterprise Server enables token capture and management access.
Is CVE-2026-18730 being exploited?
Not confirmed. CVE-2026-18730 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 0.29% probability of exploitation in the next 30 days.
How severe is CVE-2026-18730?
CVE-2026-18730 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-2026-18730?
Yes. A fix has been recorded for CVE-2026-18730. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-18730 affect?
CVE-2026-18730 affects GitHub Enterprise Server < 3.22, Fixed in 3.17.19 / 3.18.13 / 3.19.10 / 3.20.6 / 3.21.4. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-18730?
Upgrade to fixed releases immediately; restrict egress to management agents and review logs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated SSRF forces outbound requests; attacker can capture/replay HMAC token to access privileged management agent endpoints.
Immediate action required
- affected>= 3.17.0 and <= 3.17.18
- affected>= 3.18.0 and <= 3.18.12
- affected>= 3.19.0 and <= 3.19.9
- affected>= 3.20.0 and <= 3.20.5
- affected>= 3.21.0 and <= 3.21.3
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.