CVE-2022-31059Network attack vector

Stored XSS via unescaped event names

Published Jun 14, 2022 · Updated Apr 23, 2025

Stored XSS in Discourse Calendar before 1.0.1 allows attackers to execute browser script through crafted event names. Event widgets insert stored event names and notification topic titles into HTML without output escaping, causing browsers to interpret supplied markup. Exploitation requires event-management access and a site that has modified or disabled Discourse's default Content Security Policy.

CVSS severity6.5
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Discourse Calendar before 1.0.1 allows attackers to execute browser script through crafted event names. Event widgets insert stored event names and notification topic titles into HTML without output escaping, causing browsers to interpret supplied markup. Exploitation requires event-management access and a site that has modified or disabled Discourse's default Content Security Policy.

The record

CVE
CVE-2022-31059
Published
Jun 14, 2022
Updated
Apr 23, 2025
Vendor
Discourse
Product
Discourse Calendar
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Discourse · Discourse Calendarversion=< 1.0.1

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
2.1NIST NVDAV:N/AC:H/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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