Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Gotenberg versions 8.29.1 up to 8.31.0 (fixed in 8.31.0) allow any URL in the Gotenberg-Webhook-Url request header, because the default URL filter permits all destinations when no allow or deny lists are configured. An unauthenticated attacker with network access can make Gotenberg send POST requests to internal or external hosts, which can be used to probe internal services and trigger side effects, though responses are not returned to the attacker. Upgrade to Gotenberg 8.31.0 or later; the source gives no other workaround.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 6.9 | Medium | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0024, the 14th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:07 UTC First seen by agentprime
- 31 Oct 2026, 15:07 UTC Confirmed by OSV