Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
REDAXO versions before 5.21.2 (Packagist redaxo/source) have a missing CSRF protection on the package update API action in the install addon, so the update endpoint does not require a CSRF check. An attacker would need to lure a logged-in administrator to a malicious page, which could then silently trigger an addon update from the package server; the source says this could enable disruption, or remote code execution if combined with a compromised package or a downgrade to a vulnerable version. Upgrade to redaxo/source 5.21.2, 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 |
|---|---|---|---|---|
| 6.4 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0015, the 4th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 13:55 UTC First seen by agentprime
- 31 Oct 2026, 13:55 UTC Confirmed by OSV