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No exploitation reportedFix available

CVE-2021-41178

No exploitation reported by the sources we read.

  • Published2021-10-25
  • Fixed in22.2.0 · 21.0.5 · 20.0.13
  • WeaknessCWE-22 · CWE-23 · CWE-434

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, a file traversal vulnerability makes an attacker able to download arbitrary SVG images from the host system, including user provided files. This could also be leveraged into a XSS/phishing attack, an attacker could upload a malicious SVG file that mimics the Nextcloud login form and send a specially crafted link to victims. The XSS risk here is mitigated due to the fact that Nextcloud employs a strict Content-Security-Policy disallowing execution of arbitrary JavaScript. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading.

Timeline

dates in UTC
  1. 2021-10-2522:15CVE publishedNVD

Versions per branch

NVD
Nextcloud server
BranchAffectedFixed in
22.x≥ 22.1.1, < 22.2.022.2.0
21.0≥ 21.0.1, < 21.0.521.0.5
20.0≥ 20.0.3, < 20.0.1320.0.13

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • nextcloudSUSE:Package Hub 15 SP3all versions · fixed in 20.0.14-bp153.2.9.1
  • nextcloudSUSE:Package Hub 15 SP2all versions · fixed in 20.0.14-bp153.2.9.1
  • nextcloudSUSE:Package Hub 15 SP1all versions · fixed in 20.0.14-bp153.2.9.1
  • nextcloudSUSE:Package Hub 12all versions · fixed in 20.0.14-bp153.2.9.1
  • nextcloudopenSUSE:Leap 15.3all versions · fixed in 20.0.14-bp153.2.9.1
  • nextcloudopenSUSE:Leap 15.2all versions · fixed in 20.0.14-bp153.2.9.1

Full record on NVD

Fix

  1. Update Nextcloud server to 22.2.0 · 21.0.5 · 20.0.13

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.18.8known since 2026-10-23
  • NVDCVSS 3.16.5read 2026-10-23
  • NVDCVSS 2.04read 2026-10-23
  • CNAweakness (CWE)CWE-23, CWE-434known since 2026-10-23
  • NVDweakness (CWE)CWE-22read 2026-10-23
  • FIRST EPSSEPSS score1.8 %2026-11-09
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Published
2021-10-25
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-41178?

Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, a file traversal vulnerability makes an attacker able to download arbitrary SVG images from the host system, including user provided files. This could also be leveraged into a XSS/phishing attack, an attacker could upload a malicious SVG file that mimics the Nextcloud login form and send a specially crafted link to victims. The XSS risk here is mitigated due to the fact that Nextcloud employs a strict Content-Security-Policy disallowing execution of arbitrary JavaScript. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading.

Is CVE-2021-41178 actively exploited?

Active exploitation of CVE-2021-41178 has not been confirmed. Its EPSS score was 1.8% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-41178?

CVE-2021-41178 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

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