Discourse: Vulnerability in discourse-subscriptions plugin allowing users to self-grant to higher tier subscriptions

published 2026-03-31 7 mo ago modified 2026-09-08 2 mo ago also BIT-discourse-2026-33074 , EUVD-2026-17569 , GHSA-9vg5-mp49-xghh

cvss: 5.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits: 0; none known

Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, a user may be able to purchase a lower tier subscription but grant themselves the benefits that comes along with a higher tier subscription. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.

Patch / fix

fixed in 2 links 1

bitnami discourse 2026.1.3, 2026.2.2
discourse discourse 2026.1.3, 2026.2.2, 2026.3.0

github.com/discourse/discourse@c34f2aa commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 7 mo ago (2026-03-31)

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.3	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CNA	4.0	6.3	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/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
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
bitnami	discourse	>=2026.1.0, <2026.1.3 >=2026.2.0, <2026.2.2	2026.1.3 2026.2.2

Affected products

discourse discourse

Classification

Weakness

CWE-269 Improper Privilege Management
CWE-285 Improper Authorization

References

github.com /discourse/discourse/commit/c34f2aac8dcd1ae2886fa84256f607bc003f9d80
patch
github.com /discourse/discourse/security/advisories/GHSA-9vg5-mp49-xghh
vendor-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2026-33074
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary