CVE-2026-33425 impacts Discourse, an open-source discussion platform, by allowing unauthenticated users to discern private group membership through manipulation of the `exclude_groups` parameter in directory results. This vulnerability carries a CVSSv4 score of 6.9 MEDIUM, reflecting a low-complexity, network-based attack that requires no privileges or user interaction, leading to low confidentiality impact through information disclosure. There is currently no evidence of active exploitation, public exploit code, or significant community attention for this flaw. Organizations are advised to update to Discourse versions 2026.3.0-latest.1, 2026.2.1, or 2026.1.2, or implement the workaround of disabling public access to the user directory.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2026.1.0, < 2026.1.2CPE matchmatch criteria | cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:* | ||
>= 2026.2.0, < 2026.2.1CPE matchmatch criteria | cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:* | ||
2026.3.0CPE matchmatch criteria | cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.