Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Algernon versions before 1.17.9 are vulnerable on Windows hosts, where a request for a server-side script with an NTFS-style suffix (such as an alternate data stream, trailing dot, or trailing space) returns the raw script source instead of executed output. An unauthenticated remote attacker can use this against scripts on public paths or when no auth backend is configured, exposing embedded secrets such as database credentials and cookie secrets, and possibly forging sessions. Upgrade to Algernon 1.17.9 or later.
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 |
|---|---|---|---|---|
| 8.7 | High | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0063, the 50th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:06 UTC First seen by agentprime
- 31 Oct 2026, 15:06 UTC Confirmed by OSV