CVE-2021-47955
📛 CVE Title
(no title)
Description
CouchCMS 2.2.1 contains a cross-site scripting vulnerability that allows authenticated attackers to execute arbitrary JavaScript by uploading malicious SVG files through the file upload functionality. Attackers can upload SVG files containing embedded script tags to the browse.php endpoint, which are then executed in users' browsers when the files are accessed or previewed.
Overview
- State
- —
- Assigner (CNA)
- —
- CVSS severity
- medium
- CVSS score
- 5.4 / 10
- CVSS vector
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N- Effective score
- 5.4 / 10 MEDIUM source: CNA overview
- CWE(s)
- —
- Reserved
- —
- Published
- —
- Last updated
- —
- Source
- https://www.tenable.com/cve/CVE-2021-47955
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-16 16:16:21 UTC
- NVD last modified
- 2026-05-18 17:26:40 UTC
- NVD CVSS v3.1
- 5.4 / 10 MEDIUM source: disclosure@vulncheck.com
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N- Exploitability subscore
- 2.3 / 10
- Impact subscore
- 2.7 / 10
- EPSS score
- 0.0003 (probability of exploitation in next 30 days)
- EPSS percentile
- 8.66% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD-assigned CWE(s):
CWE-79
(differs from the CNA list above)
NVD / KEV / EPSS data refreshed 2026-05-25 00:05 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2021-34823 - Assigner
- VulnCheck
- Published
- May 16, 2026, 3:26:07 PM
- Updated
- May 24, 2026, 1:37:13 AM
- EUVD base score (CVSS 4.0)
-
5.1 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N - EUVD-reported EPSS
- 0.0300
- Vendors
- CouchCMS
- Products
-
CouchCMS (2.2.1)
- Aliases
-
GHSA-7q3g-gccm-822q
ENISA description: CouchCMS 2.2.1 contains a cross-site scripting vulnerability that allows authenticated attackers to execute arbitrary JavaScript by uploading malicious SVG files through the file upload functionality. Attackers can upload SVG files containing embedded script tags to the browse.php endpoint, which are then executed in users' browsers when the files are accessed or previewed.
Vendor references (0)
References embedded in the original CVE record by the assigning CNA.
None in the CVE record.
Web references (6)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://github.com/CouchCMS/CouchCMS tenable:github.com
- https://nvd.nist.gov/vuln/detail/CVE-2021-47955 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2021-47955 tenable:www.cve.org
- https://www.exploit-db.com/exploits/49636 tenable:www.exploit-db.com
- https://www.first.org/epss/ tenable:www.first.org
- https://www.vulncheck.com/advisories/couchcms-cross-site-scripting-via-svg-file-upload tenable:www.vulncheck.com
NVD-tagged references (3)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://github.com/CouchCMS/CouchCMS disclosure@vulncheck.com
- https://www.exploit-db.com/exploits/49636 disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/couchcms-cross-site-scripting-via-svg-file-upload disclosure@vulncheck.com
Remediations (10)
-
web:access.redhat.com
Learn about our open source products, services, and company. You are here
2026-05-26 03:07 UTC -
web:blog.qualys.com
Oracle released its second quarterly edition of this year's Critical Patch Update. The update received patches for 309 security vulnerabilities.
2026-05-26 03:07 UTC -
web:cyberpress.org
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026.
2026-05-26 03:07 UTC -
web:cybersecuritynews.com
Oracle released its July 2025 Critical Patch Update on July 15, addressing 309 security vulnerabilities across its extensive product portfolio.
2026-05-26 03:07 UTC -
web:feedly.com
Patch A security update was released on June 10, 2025, addressing the vulnerability across multiple Windows versions including Windows 10, Windows 11, and various Windows Server editions
2026-05-26 03:07 UTC -
web:securitricks.com
CVE CVE-2021-47955 - Score : 5.1 - Source : disclosure@vulncheck.com - Description : CouchCMS 2.2.1 contains a cross-site scripting vulnerability that allows authenticated attackers to execute arbitrary JavaScript by uploading malicious SVG files through the file upload functionality. Attackers can upload SVG files containing embedded script tags to the browse.php endpoint, which are then ...
2026-05-26 03:07 UTC -
web:support.microsoft.com
This out-of-band update for Windows 11, version 25H2 and 24H2 (KB5085518) includes fixes and improvements. To learn more about differences between security updates, optional non-security preview updates, out-of-band (OOB) updates, and continuous innovation, see Windows monthly updates explained. For information on Windows update terminology, see the different types of Windows software updates ...
2026-05-26 03:07 UTC -
web:www.cve.org
At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures
2026-05-26 03:07 UTC -
web:www.oracle.com
Critical Security Patch Updates Critical Security Patch Updates provide security patches for supported Oracle on-premises products. A Critical Security Patch Update provides targeted, high-priority security fixes in a smaller, more focused format, making them easier to apply with minimal disruption.
2026-05-26 03:07 UTC -
web:www.securityweek.com
Oracle on Tuesday announced the release of 481 new security patches as part of its April 2026 Critical Patch Update (CPU). Across the 28 product families that received security updates, more than 300 patches address vulnerabilities that are remotely exploitable without authentication.
2026-05-26 03:07 UTC
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