CVE-2023-48301Public exploitNetwork attack vector

Stored link injection via unescaped circle names

Published Nov 21, 2023 · Updated Oct 11, 2024

Stored XSS in Nextcloud Server and Enterprise Server allows remote authenticated users to open injected links through Circles search. The Circles file-search code inserts circle display names into generated HTML without escaping metacharacters, allowing attacker-supplied anchors to become clickable content. Exploitation requires an authenticated attacker to create or rename a circle and another authenticated user to click that circle in a file-search filter; the documented consequence is opening the injected link.

CVSS severity3.5
Low
EPSS probability0.64%
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 Nextcloud Server and Enterprise Server allows remote authenticated users to open injected links through Circles search. The Circles file-search code inserts circle display names into generated HTML without escaping metacharacters, allowing attacker-supplied anchors to become clickable content. Exploitation requires an authenticated attacker to create or rename a circle and another authenticated user to click that circle in a file-search filter; the documented consequence is opening the injected link.

The record

CVE
CVE-2023-48301
Published
Nov 21, 2023
Updated
Oct 11, 2024
Vendor
Nextcloud GmbH
Product
Security Advisories
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 11, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 25.0.0, < 25.0.13
  2. Affected versionversion=>= 26.0.0, < 26.0.8
  3. Affected versionversion=>= 27.0.0, < 27.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Security Advisoriesversion=>= 25.0.0, < 25.0.13; version=>= 26.0.0, < 26.0.8; version=>= 27.0.0, < 27.1.3

Published CVSS scores

3.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L
5.4NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

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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