Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2024-03-06 11:09

Modified

2025-11-06 13:25

Summary

XSS via blocked watched word in error message

Details

Discourse is an open source discussion platform. There is a cross-site scripting (XSS) vulnerability in versions 2.7.7 and earlier of the stable branch, versions 2.8.0.beta6 and earlier of the beta branch, and versions 2.8.0.beta6 and earlier of the tests-passed branch. Rendering of some error messages that contain user input can be susceptible to XSS attacks. This vulnerability only affects sites which have blocked watched words that contain HTML tags, modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest stable, beta and tests-passed versions of Discourse. As a workaround, avoid modifying or disabling Discourse’s default Content Security Policy, and blocking watched words containing HTML tags.

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "discourse",
        "purl": "pkg:bitnami/discourse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.7.7"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-41095"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*",
      "cpe:2.3:a:discourse:discourse:2.8.0:beta1:*:*:*:*:*:*",
      "cpe:2.3:a:discourse:discourse:2.8.0:beta2:*:*:*:*:*:*",
      "cpe:2.3:a:discourse:discourse:2.8.0:beta3:*:*:*:*:*:*",
      "cpe:2.3:a:discourse:discourse:2.8.0:beta4:*:*:*:*:*:*",
      "cpe:2.3:a:discourse:discourse:2.8.0:beta5:*:*:*:*:*:*",
      "cpe:2.3:a:discourse:discourse:2.8.0:beta6:*:*:*:*:*:*"
    ],
    "severity": "Medium"
  },
  "details": "Discourse is an open source discussion platform. There is a cross-site scripting (XSS) vulnerability in versions 2.7.7 and earlier of the `stable` branch, versions 2.8.0.beta6 and earlier of the `beta` branch, and versions 2.8.0.beta6 and earlier of the `tests-passed` branch. Rendering of some error messages that contain user input can be susceptible to XSS attacks. This vulnerability only affects sites which have blocked watched words that contain HTML tags, modified or disabled Discourse\u0027s default Content Security Policy. This issue is patched in the latest `stable`, `beta` and `tests-passed` versions of Discourse. As a workaround, avoid modifying or disabling Discourse\u2019s default Content Security Policy, and blocking watched words containing HTML tags.",
  "id": "BIT-discourse-2021-41095",
  "modified": "2025-11-06T13:25:46.476Z",
  "published": "2024-03-06T11:09:23.967Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59"
    },
    {
      "type": "WEB",
      "url": "https://github.com/discourse/discourse/security/advisories/GHSA-qvqx-2h7w-m479"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-41095"
    }
  ],
  "schema_version": "1.5.0",
  "summary": "XSS via blocked watched word in error message"
}

CVE-2021-41095 (GCVE-0-2021-41095)

Vulnerability from cvelistv5 – Published: 2021-09-27 19:30 – Updated: 2024-08-04 02:59

Title

XSS via blocked watched word in error message

Summary

Discourse is an open source discussion platform. There is a cross-site scripting (XSS) vulnerability in versions 2.7.7 and earlier of the `stable` branch, versions 2.8.0.beta6 and earlier of the `beta` branch, and versions 2.8.0.beta6 and earlier of the `tests-passed` branch. Rendering of some error messages that contain user input can be susceptible to XSS attacks. This vulnerability only affects sites which have blocked watched words that contain HTML tags, modified or disabled Discourse's default Content Security Policy. This issue is patched in the latest `stable`, `beta` and `tests-passed` versions of Discourse. As a workaround, avoid modifying or disabling Discourse’s default Content Security Policy, and blocking watched words containing HTML tags.

Severity ?

4.2 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/discourse/discourse/security/a…	x_refsource_CONFIRM
	https://github.com/discourse/discourse/pull/14434…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	discourse	discourse	Affected: <= 2.7.7 Affected: >= 2.8.0.beta1, <= 2.8.0.beta6

Show details on NVD website

JSON

To clipboard

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            "url": "https://github.com/discourse/discourse/pull/14434/commits/40b776b9d39c41d9273d01eecf8fe03aa39fcb59"
          }
        ],
        "title": "CVE Program Container"
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    ],
    "cna": {
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          "product": "discourse",
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          "versions": [
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      ],
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        {
          "lang": "en",
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        }
      ],
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            "baseSeverity": "MEDIUM",
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            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N",
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      "problemTypes": [
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      },
      "references": [
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          ],
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        },
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        }
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      "source": {
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        "discovery": "UNKNOWN"
      },
      "title": "XSS via blocked watched word in error message",
      "x_legacyV4Record": {
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          "ID": "CVE-2021-41095",
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        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
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                      "version": {
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                          {
                            "version_value": "\u003c= 2.7.7"
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                          }
                        ]
                      }
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

Vulnerability from bitnami_vulndb

CVE-2021-41095 (GCVE-0-2021-41095)

Tags

Sightings

Nomenclature