gomatrixserverlib is a Go library for matrix protocol federation. Dendrite is a Matrix homeserver written in Go, an alternative to Synapse. The power level parsing within gomatrixserverlib was failing to parse the `"events_default"` key of the `m.room.power_levels` event, defaulting the event default power level to zero in all cases. Power levels are the matrix terminology for user access level. In rooms where the `"events_default"` power level had been changed, this could result in events either being incorrectly authorised or rejected by Dendrite servers. gomatrixserverlib contains a fix as of commit `723fd49` and Dendrite 0.9.3 has been updated accordingly. Matrix rooms where the `"events_default"` power level has not been changed from the default of zero are not vulnerable. Users are advised to upgrade. There are no known workarounds for this issue.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/matrix-org/dendrite(Go) | 0 | 0.9.3 | N/A |
| github.com/matrix-org/gomatrixserverlib(Go) | 0 | 0.0.0-20220815091947-723fd495dde8 | N/A |
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