Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Kestra versions before 1.3.24 are vulnerable to stored cross-site scripting through the custom [[link]] Markdown syntax, which lets attacker-controlled attributes, including JavaScript event handlers, reach the rendered HTML. An attacker who can create or edit a Flow description can store the payload, and it runs in the browser of another user who views the Flow list or opens the description panel. Upgrade to Kestra 1.3.24 or later, which contains the fix.
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 | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0043, the 37th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:16 UTC First seen by agentprime
- 31 Oct 2026, 14:16 UTC Confirmed by OSV