Vulnerability-Lookup

CVE-2021-47934 (GCVE-0-2021-47934)

Vulnerability from cvelistv5 – Published: 2026-05-16 15:26 – Updated: 2026-05-18 13:43

Title

MyBB Timeline Plugin 1.0 Cross-Site Scripting and CSRF

Summary

MyBB Timeline Plugin 1.0 contains cross-site scripting vulnerabilities that allow attackers to inject malicious scripts through thread titles, post content, and user profile fields like Location and Bio. Attackers can also exploit a cross-site request forgery vulnerability in the timeline.php profile action to change a user's cover picture by crafting malicious forms that execute when victims visit affected profiles.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L

5.3 (Medium)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-18 13:43 UTC

CWE

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

Assigner

VulnCheck mitre root

References

3 references

URL	Tags
https://www.exploit-db.com/exploits/49467	exploit
https://community.mybb.com/mods.php?action=view&p…	product
https://www.vulncheck.com/advisories/mybb-timelin…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
MyBB	MyBB Timeline Plugin	Affected: 1.0 cpe:2.3:a:mybb:mybb:1.0:::::::*

Date Public

2021-01-21 00:00

Credits

0xB9

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2021-47934

Vulnerability from fkie_nvd - Published: 2026-05-16 16:16 - Updated: 2026-06-17 04:18

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://community.mybb.com/mods.php?action=view&pid=1428
	disclosure@vulncheck.com	https://www.exploit-db.com/exploits/49467
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/mybb-timeline-plugin-cross-site-scripting-and-csrf

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "MyBB Timeline Plugin",
          "vendor": "MyBB",
          "versions": [
            {
              "status": "affected",
              "version": "1.0"
            }
          ]
        }
      ],
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    }
  ],
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    }
  ],
  "id": "CVE-2021-47934",
  "lastModified": "2026-06-17T04:18:47.163",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
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        "type": "Secondary"
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    ],
    "cvssMetricV40": [
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        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
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          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.9,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
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          "subConfidentialityImpact": "LOW",
          "subIntegrityImpact": "LOW",
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          "version": "4.0",
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  "published": "2026-05-16T16:16:21.267",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://community.mybb.com/mods.php?action=view\u0026pid=1428"
    },
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    }
  ],
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  "vulnStatus": "Deferred",
  "weaknesses": [
    {
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        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
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      "type": "Secondary"
    }
  ]
}

GHSA-9CV3-XR79-R4JW

Vulnerability from github – Published: 2026-05-16 18:31 – Updated: 2026-05-16 18:31

Details

Severity

5.3 (Medium)


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

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2021-47934"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-16T16:16:21Z",
    "severity": "MODERATE"
  },
  "details": "MyBB Timeline Plugin 1.0 contains cross-site scripting vulnerabilities that allow attackers to inject malicious scripts through thread titles, post content, and user profile fields like Location and Bio. Attackers can also exploit a cross-site request forgery vulnerability in the timeline.php profile action to change a user\u0027s cover picture by crafting malicious forms that execute when victims visit affected profiles.",
  "id": "GHSA-9cv3-xr79-r4jw",
  "modified": "2026-05-16T18:31:38Z",
  "published": "2026-05-16T18:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47934"
    },
    {
      "type": "WEB",
      "url": "https://community.mybb.com/mods.php?action=view\u0026pid=1428"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/exploits/49467"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/mybb-timeline-plugin-cross-site-scripting-and-csrf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L/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",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2021-47934 (GCVE-0-2021-47934)

FKIE_CVE-2021-47934

GHSA-9CV3-XR79-R4JW

Tags

Sightings

Nomenclature

Related by attack behaviour