XSS in Discourse Discourse-Calendar
CVE-2022-31059
Discourse Calendar is a calendar plugin for Discourse, an open-source messaging app. Prior to version 1.0.1, parsing and rendering of Event names can be susceptible to cross-site scripting (XSS) attacks. This vulnerability only affects sites which have modified or disabled Discourse’s default Content Security Policy. This issue is patched in version 1.0.1 of the Discourse Calendar plugin. As a workaround, ensure that the Content Security Policy is enabled, and has not been modified in a way which would make it more vulnerable to XSS attacks.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.007 (52.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Discourse Discourse-Calendar — versions < 1.0.1
- Discourse Calendar
Weakness classification (CWE)
References
- github.com/discourse/discourse-calendar/security/advisories/GHSA-c783-x9vm-xxp5 (Third Party Advisory)
- github.com/discourse/discourse-calendar/pull/280 (Patch, Third Party Advisory, Issue Tracking)
- github.com/discourse/discourse-calendar/commit/2719b9e81994e961bf8c4e12b4556dc9… (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-31059?
- CVE-2022-31059 is a medium-severity vulnerability in Discourse Discourse-Calendar, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2022-06-14.
- How severe is CVE-2022-31059?
- Medium severity. CVSS v3 base score is 6.5 out of 10.