Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
EGroupware, as published under the Packagist package egroupware/egroupware, is vulnerable in versions before 23.1.20260224 and from 26.0.20251208 before 26.2.20260224. An authenticated attacker can exploit a flaw in the course-teacher authorization check of an upload handler, combined with a file write and an arbitrary file read, to run commands on the server; if user self-registration is enabled, the source says no prior authentication may be needed. Upgrade to 23.1.20260224 or 26.2.20260224, which are the fixed versions listed.
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:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0097, the 62nd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:00 UTC First seen by agentprime
- 31 Oct 2026, 14:00 UTC Confirmed by OSV