Discourse CSP nonce reuse vulnerability for anonymous users

published 2023-07-28 3 y ago modified 2026-06-17 4 mo ago also BIT-discourse-2023-37467 , EUVD-2023-41364 , GHSA-gr5h-hm62-jr3j

cvss: 6.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits: 0; none known

Discourse is an open source discussion platform. Prior to version 3.1.0.beta7 of the `beta` and `tests-passed` branches, a CSP (Content Security Policy) nonce reuse vulnerability was discovered could allow cross-site scripting (XSS) attacks to bypass CSP protection for anonymous (i.e. unauthenticated) users. There are no known XSS vectors at the moment, but should one be discovered, this vulnerability would allow the XSS attack to bypass CSP and execute successfully. This vulnerability isn't applicable to logged-in users. Version 3.1.0.beta7 contains a patch. The stable branch doesn't have this vulnerability. A workaround to prevent the vulnerability is to disable Google Tag Manager, i.e., unset the `gtm container id` setting.

Patch / fix

fixed in 1 links 1

discourse discourse 3.1.0.beta7

github.com/discourse/discourse@0976c8f commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-10-10)

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.8	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
OSV	3.1	6.8	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem	package	affected	fixed in
bitnami	discourse	>=1.1.0-beta1, <=1.1.0-beta1 >=1.1.0-beta2, <=1.1.0-beta2 >=1.1.0-beta3, <=1.1.0-beta3 >=1.1.0-beta4, <=1.1.0-beta4 >=1.1.0-beta5, <=1.1.0-beta5 >=1.1.0-beta6, <=1.1.0-beta6 >=1.1.0-beta6b, <=1.1.0-beta6b >=1.1.0-beta7, <=1.1.0-beta7 >=1.1.0-beta8, <=1.1.0-beta8 >=1.2.0-beta1, <=1.2.0-beta1 >=1.2.0-beta2, <=1.2.0-beta2 >=1.2.0-beta3, <=1.2.0-beta3 >=1.2.0-beta4, <=1.2.0-beta4 >=1.2.0-beta5, <=1.2.0-beta5 >=1.2.0-beta6, <=1.2.0-beta6 >=1.2.0-beta7, <=1.2.0-beta7 >=1.2.0-beta8, <=1.2.0-beta8 >=1.2.0-beta9, <=1.2.0-beta9 >=1.3.0-beta1, <=1.3.0-beta1 >=1.3.0-beta10, <=1.3.0-beta10 >=1.3.0-beta11, <=1.3.0-beta11 >=1.3.0-beta2, <=1.3.0-beta2 >=1.3.0-beta3, <=1.3.0-beta3 >=1.3.0-beta4, <=1.3.0-beta4 >=1.3.0-beta5, <=1.3.0-beta5 >=1.3.0-beta6, <=1.3.0-beta6 >=1.3.0-beta7, <=1.3.0-beta7 >=1.3.0-beta8, <=1.3.0-beta8 >=1.3.0-beta9, <=1.3.0-beta9 >=1.4.0-beta1, <=1.4.0-beta1 >=1.4.0-beta10, <=1.4.0-beta10 >=1.4.0-beta11, <=1.4.0-beta11 >=1.4.0-beta12, <=1.4.0-beta12 >=1.4.0-beta2, <=1.4.0-beta2 >=1.4.0-beta3, <=1.4.0-beta3 >=1.4.0-beta4, <=1.4.0-beta4 >=1.4.0-beta5, <=1.4.0-beta5 >=1.4.0-beta6, <=1.4.0-beta6 >=1.4.0-beta7, <=1.4.0-beta7 >=1.4.0-beta8, <=1.4.0-beta8 >=1.4.0-beta9, <=1.4.0-beta9 >=1.5.0-beta1, <=1.5.0-beta1 >=1.5.0-beta10, <=1.5.0-beta10 >=1.5.0-beta11, <=1.5.0-beta11 >=1.5.0-beta12, <=1.5.0-beta12 >=1.5.0-beta13, <=1.5.0-beta13 >=1.5.0-beta13b, <=1.5.0-beta13b >=1.5.0-beta14, <=1.5.0-beta14 >=1.5.0-beta2, <=1.5.0-beta2 >=1.5.0-beta3, <=1.5.0-beta3 >=1.5.0-beta4, <=1.5.0-beta4 >=1.5.0-beta5, <=1.5.0-beta5 >=1.5.0-beta6, <=1.5.0-beta6 >=1.5.0-beta7, <=1.5.0-beta7 >=1.5.0-beta8, <=1.5.0-beta8 >=1.5.0-beta9, <=1.5.0-beta9 >=1.6.0-beta1, <=1.6.0-beta1 >=1.6.0-beta10, <=1.6.0-beta10 >=1.6.0-beta11, <=1.6.0-beta11 >=1.6.0-beta12, <=1.6.0-beta12 >=1.6.0-beta2, <=1.6.0-beta2 >=1.6.0-beta3, <=1.6.0-beta3 >=1.6.0-beta4, <=1.6.0-beta4 >=1.6.0-beta5, <=1.6.0-beta5 >=1.6.0-beta6, <=1.6.0-beta6 >=1.6.0-beta7, <=1.6.0-beta7 >=1.6.0-beta8, <=1.6.0-beta8 >=1.6.0-beta9, <=1.6.0-beta9 >=1.7.0-beta1, <=1.7.0-beta1 >=1.7.0-beta10, <=1.7.0-beta10 >=1.7.0-beta11, <=1.7.0-beta11 >=1.7.0-beta2, <=1.7.0-beta2 >=1.7.0-beta3, <=1.7.0-beta3 >=1.7.0-beta4, <=1.7.0-beta4 >=1.7.0-beta5, <=1.7.0-beta5 >=1.7.0-beta6, <=1.7.0-beta6 >=1.7.0-beta7, <=1.7.0-beta7 >=1.7.0-beta8, <=1.7.0-beta8 >=1.7.0-beta9, <=1.7.0-beta9 >=1.8.0-beta1, <=1.8.0-beta1 >=1.8.0-beta10, <=1.8.0-beta10 >=1.8.0-beta11, <=1.8.0-beta11 >=1.8.0-beta12, <=1.8.0-beta12 >=1.8.0-beta13, <=1.8.0-beta13 >=1.8.0-beta2, <=1.8.0-beta2 >=1.8.0-beta3, <=1.8.0-beta3 >=1.8.0-beta4, <=1.8.0-beta4 >=1.8.0-beta5, <=1.8.0-beta5 >=1.8.0-beta6, <=1.8.0-beta6 >=1.8.0-beta7, <=1.8.0-beta7 >=1.8.0-beta8, <=1.8.0-beta8 >=1.8.0-beta9, <=1.8.0-beta9 >=1.9.0-beta1, <=1.9.0-beta1 >=1.9.0-beta10, <=1.9.0-beta10 >=1.9.0-beta11, <=1.9.0-beta11 >=1.9.0-beta12, <=1.9.0-beta12 >=1.9.0-beta13, <=1.9.0-beta13 >=1.9.0-beta14, <=1.9.0-beta14 >=1.9.0-beta15, <=1.9.0-beta15 >=1.9.0-beta16, <=1.9.0-beta16 >=1.9.0-beta17, <=1.9.0-beta17 >=1.9.0-beta2, <=1.9.0-beta2 >=1.9.0-beta3, <=1.9.0-beta3 >=1.9.0-beta4, <=1.9.0-beta4 >=1.9.0-beta5, <=1.9.0-beta5 >=1.9.0-beta6, <=1.9.0-beta6 >=1.9.0-beta7, <=1.9.0-beta7 >=1.9.0-beta8, <=1.9.0-beta8 >=1.9.0-beta9, <=1.9.0-beta9 >=2.0.0-beta1, <=2.0.0-beta1 >=2.0.0-beta10, <=2.0.0-beta10 >=2.0.0-beta2, <=2.0.0-beta2 >=2.0.0-beta3, <=2.0.0-beta3 >=2.0.0-beta4, <=2.0.0-beta4 >=2.0.0-beta5, <=2.0.0-beta5 >=2.0.0-beta6, <=2.0.0-beta6 >=2.0.0-beta7, <=2.0.0-beta7 >=2.0.0-beta8, <=2.0.0-beta8 >=2.0.0-beta9, <=2.0.0-beta9 >=2.1.0-beta1, <=2.1.0-beta1 >=2.1.0-beta2, <=2.1.0-beta2 >=2.1.0-beta3, <=2.1.0-beta3 >=2.1.0-beta4, <=2.1.0-beta4 >=2.1.0-beta5, <=2.1.0-beta5 >=2.1.0-beta6, <=2.1.0-beta6 >=2.2.0-beta1, <=2.2.0-beta1 >=2.2.0-beta10, <=2.2.0-beta10 >=2.2.0-beta2, <=2.2.0-beta2 >=2.2.0-beta3, <=2.2.0-beta3 >=2.2.0-beta4, <=2.2.0-beta4 >=2.2.0-beta5, <=2.2.0-beta5 >=2.2.0-beta6, <=2.2.0-beta6 >=2.2.0-beta7, <=2.2.0-beta7 >=2.2.0-beta8, <=2.2.0-beta8 >=2.2.0-beta9, <=2.2.0-beta9 >=2.3.0-beta1, <=2.3.0-beta1 >=2.3.0-beta10, <=2.3.0-beta10 >=2.3.0-beta11, <=2.3.0-beta11 >=2.3.0-beta2, <=2.3.0-beta2 >=2.3.0-beta3, <=2.3.0-beta3 >=2.3.0-beta4, <=2.3.0-beta4 >=2.3.0-beta5, <=2.3.0-beta5 >=2.3.0-beta6, <=2.3.0-beta6 >=2.3.0-beta7, <=2.3.0-beta7 >=2.3.0-beta8, <=2.3.0-beta8 >=2.3.0-beta9, <=2.3.0-beta9 >=2.4.0-beta1, <=2.4.0-beta1 >=2.4.0-beta10, <=2.4.0-beta10 >=2.4.0-beta11, <=2.4.0-beta11 >=2.4.0-beta2, <=2.4.0-beta2 >=2.4.0-beta3, <=2.4.0-beta3 >=2.4.0-beta4, <=2.4.0-beta4 >=2.4.0-beta5, <=2.4.0-beta5 >=2.4.0-beta6, <=2.4.0-beta6 >=2.4.0-beta7, <=2.4.0-beta7 >=2.4.0-beta8, <=2.4.0-beta8 >=2.4.0-beta9, <=2.4.0-beta9 >=2.5.0-beta1, <=2.5.0-beta1 >=2.5.0-beta2, <=2.5.0-beta2 >=2.5.0-beta3, <=2.5.0-beta3 >=2.5.0-beta4, <=2.5.0-beta4 >=2.5.0-beta5, <=2.5.0-beta5 >=2.5.0-beta6, <=2.5.0-beta6 >=2.5.0-beta7, <=2.5.0-beta7 >=2.6.0-beta1, <=2.6.0-beta1 >=2.6.0-beta2, <=2.6.0-beta2 >=2.6.0-beta3, <=2.6.0-beta3 >=2.6.0-beta4, <=2.6.0-beta4 >=2.6.0-beta5, <=2.6.0-beta5 >=2.6.0-beta6, <=2.6.0-beta6 >=2.7.0-beta1, <=2.7.0-beta1 >=2.7.0-beta2, <=2.7.0-beta2 >=2.7.0-beta3, <=2.7.0-beta3 >=2.7.0-beta4, <=2.7.0-beta4 >=2.7.0-beta5, <=2.7.0-beta5 >=2.7.0-beta6, <=2.7.0-beta6 >=2.7.0-beta7, <=2.7.0-beta7 >=2.7.0-beta8, <=2.7.0-beta8 >=2.7.0-beta9, <=2.7.0-beta9 >=2.8.0-beta1, <=2.8.0-beta1 >=2.8.0-beta10, <=2.8.0-beta10 >=2.8.0-beta11, <=2.8.0-beta11 >=2.8.0-beta2, <=2.8.0-beta2 >=2.8.0-beta3, <=2.8.0-beta3 >=2.8.0-beta4, <=2.8.0-beta4 >=2.8.0-beta5, <=2.8.0-beta5 >=2.8.0-beta6, <=2.8.0-beta6 >=2.8.0-beta7, <=2.8.0-beta7 >=2.8.0-beta8, <=2.8.0-beta8 >=2.8.0-beta9, <=2.8.0-beta9 >=2.9.0-beta1, <=2.9.0-beta1 >=2.9.0-beta10, <=2.9.0-beta10 >=2.9.0-beta11, <=2.9.0-beta11 >=2.9.0-beta12, <=2.9.0-beta12 >=2.9.0-beta13, <=2.9.0-beta13 >=2.9.0-beta14, <=2.9.0-beta14 >=2.9.0-beta2, <=2.9.0-beta2 >=2.9.0-beta3, <=2.9.0-beta3 >=2.9.0-beta4, <=2.9.0-beta4 >=2.9.0-beta5, <=2.9.0-beta5 >=2.9.0-beta6, <=2.9.0-beta6 >=2.9.0-beta7, <=2.9.0-beta7 >=2.9.0-beta8, <=2.9.0-beta8 >=2.9.0-beta9, <=2.9.0-beta9 >=3.0.0-beta15, <=3.0.0-beta15 >=3.0.0-beta16, <=3.0.0-beta16 >=3.1.0-beta1, <=3.1.0-beta1 >=3.1.0-beta2, <=3.1.0-beta2 >=3.1.0-beta3, <=3.1.0-beta3 >=3.1.0-beta5, <=3.1.0-beta5 >=3.1.0-beta6, <=3.1.0-beta6	no fix listed

Affected products

discourse discourse

Classification

Weakness

CWE-323 Reusing a Nonce, Key Pair in Encryption
CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /discourse/discourse/commit/0976c8fad6970b6182e7837bf87de07709407f25
patch, web
github.com /discourse/discourse/security/advisories/GHSA-gr5h-hm62-jr3j
vendor-advisory, 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.

Summary